Dada ( / ˈ d ɑː d ɑː / ) or Dadaism was an anti-establishment art movement that developed in 1915 in the context of the Great War and the earlier anti-art movement. Early centers for dadaism included Zürich and Berlin. Within a few years, the movement had spread to New York City and a variety of artistic centers in Europe and Asia.
191-627: Within the umbrella of the movement, people used a wide variety of artistic forms to protest the logic , reason , and aestheticism of modern capitalism and modern war. To develop their protest, artists tended to make use of nonsense , irrationality , and an anti-bourgeois sensibility. The art of the movement began primarily as performance art, but eventually spanned visual, literary, and sound media, including collage , sound poetry , cut-up writing , and sculpture. Dadaist artists expressed their discontent toward violence, war, and nationalism and maintained political affinities with radical politics on
382-501: A r y ) ∧ Q ( J o h n ) ) {\displaystyle \exists Q(Q(Mary)\land Q(John))} " . In this case, the existential quantifier is applied to the predicate variable " Q {\displaystyle Q} " . The added expressive power is especially useful for mathematics since it allows for more succinct formulations of mathematical theories. But it has drawbacks in regard to its meta-logical properties and ontological implications, which
573-591: A bottle rack, and was active in the Society of Independent Artists . In 1917 he submitted the now famous Fountain , a urinal signed R. Mutt, to the Society of Independent Artists exhibition but they rejected the piece. First an object of scorn within the arts community, the Fountain has since become almost canonized by some as one of the most recognizable modernist works of sculpture. Art world experts polled by
764-496: A bourgeois was a character flaw inherent to the masculine mystique; therefore, the ideology of Italian fascism scornfully defined the bourgeois man as "spiritually castrated". Karl Marx said that the culture of a society is dominated by the mores of the ruling-class , wherein their superimposed value system is abided by each social class (the upper, the middle, the lower) regardless of the socio-economic results it yields to them. In that sense, contemporary societies are bourgeois to
955-487: A brightly colored rag are more necessary expressions than those of some ass who seeks to immortalize himself in oils in finite parlors. The groups in Germany were not as strongly anti-art as other groups. Their activity and art were more political and social, with corrosive manifestos and propaganda, satire, public demonstrations and overt political activities. The intensely political and war-torn environment of Berlin had
1146-445: A central role in many arguments found in everyday discourse and the sciences. Ampliative arguments are not automatically incorrect. Instead, they just follow different standards of correctness. The support they provide for their conclusion usually comes in degrees. This means that strong ampliative arguments make their conclusion very likely while weak ones are less certain. As a consequence, the line between correct and incorrect arguments
1337-480: A certain cost: the premises support the conclusion in the sense that they make its truth more likely but they do not ensure its truth. This means that the conclusion of an ampliative argument may be false even though all its premises are true. This characteristic is closely related to non-monotonicity and defeasibility : it may be necessary to retract an earlier conclusion upon receiving new information or in light of new inferences drawn. Ampliative reasoning plays
1528-573: A complex argument to be successful, each link of the chain has to be successful. Arguments and inferences are either correct or incorrect. If they are correct then their premises support their conclusion. In the incorrect case, this support is missing. It can take different forms corresponding to the different types of reasoning . The strongest form of support corresponds to deductive reasoning . But even arguments that are not deductively valid may still be good arguments because their premises offer non-deductive support to their conclusions. For such cases,
1719-425: A conclusion. Logic is interested in whether arguments are correct, i.e. whether their premises support the conclusion. These general characterizations apply to logic in the widest sense, i.e., to both formal and informal logic since they are both concerned with assessing the correctness of arguments. Formal logic is the traditionally dominant field, and some logicians restrict logic to formal logic. Formal logic
1910-403: A controversial Dada exhibition in 1920 which focused on nonsense and anti-bourgeois sentiments. Cologne's Early Spring Exhibition was set up in a pub, and required that participants walk past urinals while being read lewd poetry by a woman in a communion dress. The police closed the exhibition on grounds of obscenity, but it was re-opened when the charges were dropped. Like Zürich, New York City
2101-712: A dramatic impact on the ideas of Berlin Dadaists. Conversely, New York's geographic distance from the war spawned its more theoretically driven, less political nature. According to Hans Richter , a Dadaist who was in Berlin yet "aloof from active participation in Berlin Dada", several distinguishing characteristics of the Dada movement there included: "its political element and its technical discoveries in painting and literature"; "inexhaustible energy"; "mental freedom which included
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#17327731890412292-510: A formal language together with a set of axioms and a proof system used to draw inferences from these axioms. In logic, axioms are statements that are accepted without proof. They are used to justify other statements. Some theorists also include a semantics that specifies how the expressions of the formal language relate to real objects. Starting in the late 19th century, many new formal systems have been proposed. A formal language consists of an alphabet and syntactic rules. The alphabet
2483-686: A formal language while informal logic investigates them in their original form. On this view, the argument "Birds fly. Tweety is a bird. Therefore, Tweety flies." belongs to natural language and is examined by informal logic. But the formal translation "(1) ∀ x ( B i r d ( x ) → F l i e s ( x ) ) {\displaystyle \forall x(Bird(x)\to Flies(x))} ; (2) B i r d ( T w e e t y ) {\displaystyle Bird(Tweety)} ; (3) F l i e s ( T w e e t y ) {\displaystyle Flies(Tweety)} "
2674-415: A given argument is valid. Because of the reliance on formal language, natural language arguments cannot be studied directly. Instead, they need to be translated into formal language before their validity can be assessed. The term "logic" can also be used in a slightly different sense as a countable noun. In this sense, a logic is a logical formal system. Distinct logics differ from each other concerning
2865-551: A given conclusion based on a set of premises. This distinction does not just apply to logic but also to games. In chess , for example, the definitory rules dictate that bishops may only move diagonally. The strategic rules, on the other hand, describe how the allowed moves may be used to win a game, for instance, by controlling the center and by defending one's king . It has been argued that logicians should give more emphasis to strategic rules since they are highly relevant for effective reasoning. A formal system of logic consists of
3056-402: A great variety of topics. They include metaphysical theses about ontological categories and problems of scientific explanation. But in a more narrow sense, it is identical to term logic or syllogistics. A syllogism is a form of argument involving three propositions: two premises and a conclusion. Each proposition has three essential parts: a subject , a predicate, and a copula connecting
3247-618: A group of artists and poets associated with the Cabaret Voltaire in Zürich. Dada rejected reason and logic, prizing nonsense, irrationality and intuition. The origin of the name Dada is unclear; some believe that it is a nonsensical word. Others maintain that it originates from the Romanian artists Tristan Tzara's and Marcel Janco's frequent use of the words "da, da," meaning "yes, yes" in the Romanian language. Another theory says that
3438-431: A hip-hop group Migos produced a song Bad and Boujee , featuring an intentional misspelling of the word as "boujee" – a term which has particularly been used by African Americans in reference to African Americans. The term refers to a person of lower or middle class doing pretentious activities or virtue signalling as an affectation of the upper-class. The bourgeoisie emerged as a historical and political phenomenon in
3629-469: A late-comer into an originating force. Dada emerged from a period of artistic and literary movements like Futurism , Cubism and Expressionism ; centered mainly in Italy, France and Germany respectively, in those years. However, unlike the earlier movements Dada was able to establish a broad base of support, giving rise to a movement that was international in scope. Its adherents were based in cities all over
3820-614: A logical connective like "and" to form a new complex proposition. In Aristotelian logic, the subject can be universal , particular , indefinite , or singular . For example, the term "all humans" is a universal subject in the proposition "all humans are mortal". A similar proposition could be formed by replacing it with the particular term "some humans", the indefinite term "a human", or the singular term "Socrates". Aristotelian logic only includes predicates for simple properties of entities. But it lacks predicates corresponding to relations between entities. The predicate can be linked to
4011-413: A love affair with a pretty widow) come to naught because he is existentially afraid. Yet, George F. Babbitt sublimates his desire for self-respect, and encourages his son to rebel against the conformity that results from bourgeois prosperity, by recommending that he be true to himself: Don't be scared of the family. No, nor all of zenith. Nor of yourself, the way I've been. Many of the satirical films by
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#17327731890414202-467: A misunderstanding which has occurred in other languages as well. The bourgeoisie in France and many French-speaking countries consists of five evolving social layers: petite bourgeoisie , moyenne bourgeoisie , grande bourgeoisie , haute bourgeoisie and ancienne bourgeoisie . The petite bourgeoisie is the equivalent of the modern-day middle class, or refers to "a social class between
4393-646: A new gallery, and Hugo Ball left for Bern. Tzara began a relentless campaign to spread Dada ideas. He bombarded French and Italian artists and writers with letters, and soon emerged as the Dada leader and master strategist. The Cabaret Voltaire re-opened, and is still in the same place at the Spiegelgasse 1 in the Niederdorf. Zürich Dada, with Tzara at the helm, published the art and literature review Dada beginning in July 1917, with five editions from Zürich and
4584-608: A party leader in 1934, "The economic system of our day is the creation of the Jews." Hitler said to Benito Mussolini that capitalism had "run its course". Hitler also said that the business bourgeoisie "know nothing except their profit. 'Fatherland' is only a word for them." Hitler was personally disgusted with the ruling bourgeois elites of Germany during the period of the Weimar Republic, whom he referred to as "cowardly shits". Because of their ascribed cultural excellence as
4775-426: A preference for cake or cherries, to fill a void. The shock and scandal the movement inflamed was deliberate; Dadaist magazines were banned and their exhibits closed. Some of the artists even faced imprisonment. These provocations were part of the entertainment but, over time, audiences' expectations eventually outpaced the movement's capacity to deliver. As the artists' well-known "sarcastic laugh" started to come from
4966-528: A pretentious manner; describing his philistinism in Bonifica antiborghese (1939), Roberto Paravese comments on the: Middle class, middle man, incapable of great virtue or great vice: and there would be nothing wrong with that, if only he would be willing to remain as such; but, when his child-like or feminine tendency to camouflage pushes him to dream of grandeur, honours, and thus riches, which he cannot achieve honestly with his own "second-rate" powers, then
5157-403: A protest "against this world of mutual destruction". According to Hans Richter Dada was not art: it was " anti-art ". Dada represented the opposite of everything which art stood for. Where art was concerned with traditional aesthetics , Dada ignored aesthetics. If art was to appeal to sensibilities, Dada was intended to offend. Additionally, Dada attempted to reflect onto human perception and
5348-511: A psychologically constricted worldview , regarding the rearing of children, contemporary sociologists claim to have identified "progressive" middle-class values, such as respect for non-conformity, self-direction, autonomy , gender equality , and the encouragement of innovation; as in the Victorian Era, the transposition to the US of the bourgeois system of social values has been identified as
5539-557: A requisite for employment success in the professions. Bourgeois values are dependent on rationalism , which began with the economic sphere and moves into every sphere of life which is formulated by Max Weber. The beginning of rationalism is commonly called the Age of Reason . Much like the Marxist critics of that period, Weber was concerned with the growing ability of large corporations and nations to increase their power and reach throughout
5730-664: A sentence like "yesterday was Sunday and the weather was good". It is only true if both of its input variables, p {\displaystyle p} ("yesterday was Sunday") and q {\displaystyle q} ("the weather was good"), are true. In all other cases, the expression as a whole is false. Other important logical connectives are ¬ {\displaystyle \lnot } ( not ), ∨ {\displaystyle \lor } ( or ), → {\displaystyle \to } ( if...then ), and ↑ {\displaystyle \uparrow } ( Sheffer stroke ). Given
5921-665: A set of premises that leads to a conclusion. An example is the argument from the premises "it's Sunday" and "if it's Sunday then I don't have to work" leading to the conclusion "I don't have to work". Premises and conclusions express propositions or claims that can be true or false. An important feature of propositions is their internal structure. For example, complex propositions are made up of simpler propositions linked by logical vocabulary like ∧ {\displaystyle \land } ( and ) or → {\displaystyle \to } ( if...then ). Simple propositions also have parts, like "Sunday" or "work" in
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6112-577: A short-lived Dutch Dada magazine called Mécano (1922–23). Another Dutchman identified by K. Schippers in his study of the movement in the Netherlands was the Groningen typographer H. N. Werkman , who was in touch with van Doesburg and Schwitters while editing his own magazine, The Next Call (1923–6). Two more artists mentioned by Schippers were German-born and eventually settled in the Netherlands. These were Otto van Rees, who had taken part in
6303-410: A social class oriented to economic materialism and hedonism , and to upholding the political and economic interests of the capitalist ruling-class . Historically, the medieval French word bourgeois denoted the inhabitants of the bourgs (walled market-towns), the craftsmen , artisans , merchants , and others, who constituted "the bourgeoisie". They were the socio-economic class between
6494-601: A social class, the Italian fascist régime (1922–45) of Prime Minister Benito Mussolini regarded the bourgeoisie as an obstacle to modernism . Nonetheless, the Fascist State ideologically exploited the Italian bourgeoisie and their materialistic, middle-class spirit, for the more efficient cultural manipulation of the upper (aristocratic) and the lower (working) classes of Italy. In 1938, Prime Minister Mussolini gave
6685-579: A social identity famously mocked in Molière 's comedy Le Bourgeois gentilhomme (1670), which satirizes buying the trappings of a noble-birth identity as the means of climbing the social ladder. The 18th century saw a partial rehabilitation of bourgeois values in genres such as the drame bourgeois (bourgeois drama) and " bourgeois tragedy ". Emerging in the 1970s, the shortened term "bougie" became slang , referring to things or attitudes which are middle class, pretentious and suburban . In 2016,
6876-402: A speech wherein he established a clear ideological distinction between capitalism (the social function of the bourgeoisie) and the bourgeoisie (as a social class), whom he dehumanized by reducing them into high-level abstractions: a moral category and a state of mind. Culturally and philosophically, Mussolini isolated the bourgeoisie from Italian society by portraying them as social parasites upon
7067-645: A strong appeal to the middle class . The financial collapse of the white collar middle-class of the 1920s figures much in their strong support of Nazism. In the poor country that was the Weimar Republic of the early 1930s, the Nazi Party realised their social policies with food and shelter for the unemployed and the homeless—who were later recruited into the Brownshirt Sturmabteilung (SA – Storm Detachments). Adolf Hitler
7258-420: Is sound when its proof system cannot derive a conclusion from a set of premises unless it is semantically entailed by them. In other words, its proof system cannot lead to false conclusions, as defined by the semantics. A system is complete when its proof system can derive every conclusion that is semantically entailed by its premises. In other words, its proof system can lead to any true conclusion, as defined by
7449-461: Is a comedy-ballet that satirises Monsieur Jourdain, the prototypical nouveau riche man who buys his way up the social-class scale, to realise his aspirations of becoming a gentleman, to which end he studies dancing, fencing, and philosophy, the trappings and accomplishments of a gentleman, to be able to pose as a man of noble birth , someone who, in 17th-century France, was a man to the manor born; Jourdain's self-transformation also requires managing
7640-402: Is a reasonable man of solid character. Yet, in the children of Buddenbrook Jr., the materially comfortable style of life provided by the dedication to solid, middle-class values elicits decadence: The fickle daughter, Toni, lacks and does not seek a purpose in life; son Christian is honestly decadent, and lives the life of a ne'er-do-well; and the businessman son, Thomas, who assumes command of
7831-476: Is a red planet". For most types of logic, it is accepted that premises and conclusions have to be truth-bearers . This means that they have a truth value : they are either true or false. Contemporary philosophy generally sees them either as propositions or as sentences . Propositions are the denotations of sentences and are usually seen as abstract objects . For example, the English sentence "the tree
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8022-441: Is a restricted version of classical logic. It uses the same symbols but excludes some rules of inference. For example, according to the law of double negation elimination, if a sentence is not not true, then it is true. This means that A {\displaystyle A} follows from ¬ ¬ A {\displaystyle \lnot \lnot A} . This is a valid rule of inference in classical logic but it
8213-416: Is also known as symbolic logic and is widely used in mathematical logic . It uses a formal approach to study reasoning: it replaces concrete expressions with abstract symbols to examine the logical form of arguments independent of their concrete content. In this sense, it is topic-neutral since it is only concerned with the abstract structure of arguments and not with their concrete content. Formal logic
8404-453: Is an example of the existential quantifier " ∃ {\displaystyle \exists } " applied to the individual variable " x {\displaystyle x} " . In higher-order logics, quantification is also allowed over predicates. This increases its expressive power. For example, to express the idea that Mary and John share some qualities, one could use the formula " ∃ Q ( Q ( M
8595-495: Is associated with informal fallacies , critical thinking , and argumentation theory . Informal logic examines arguments expressed in natural language whereas formal logic uses formal language . When used as a countable noun , the term "a logic" refers to a specific logical formal system that articulates a proof system . Logic plays a central role in many fields, such as philosophy , mathematics , computer science , and linguistics . Logic studies arguments, which consist of
8786-415: Is blurry in some cases, such as when the premises offer weak but non-negligible support. This contrasts with deductive arguments, which are either valid or invalid with nothing in-between. The terminology used to categorize ampliative arguments is inconsistent. Some authors, like James Hawthorne, use the term " induction " to cover all forms of non-deductive arguments. But in a more narrow sense, induction
8977-421: Is commonly defined in terms of arguments or inferences as the study of their correctness. An argument is a set of premises together with a conclusion. An inference is the process of reasoning from these premises to the conclusion. But these terms are often used interchangeably in logic. Arguments are correct or incorrect depending on whether their premises support their conclusion. Premises and conclusions, on
9168-407: Is controversial because it belongs to the field of psychology , not logic, and because appearances may be different for different people. Fallacies are usually divided into formal and informal fallacies. For formal fallacies, the source of the error is found in the form of the argument. For example, denying the antecedent is one type of formal fallacy, as in "if Othello is a bachelor, then he
9359-453: Is deductively valid. For deductive validity, it does not matter whether the premises or the conclusion are actually true. So the argument "(1) all frogs are mammals; (2) no cats are mammals; (3) therefore no cats are frogs" is also valid because the conclusion follows necessarily from the premises. According to an influential view by Alfred Tarski , deductive arguments have three essential features: (1) they are formal, i.e. they depend only on
9550-487: Is established by verification using a proof. Intuitionistic logic is especially prominent in the field of constructive mathematics , which emphasizes the need to find or construct a specific example to prove its existence. Bourgeois The bourgeoisie ( / ˌ b ʊər ʒ w ɑː ˈ z iː / BOOR -zhwah- ZEE , French: [buʁʒwazi] ) are a class of business owners , merchants and wealthy people, in general, which emerged in
9741-610: Is green" is different from the German sentence "der Baum ist grün" but both express the same proposition. Propositional theories of premises and conclusions are often criticized because they rely on abstract objects. For instance, philosophical naturalists usually reject the existence of abstract objects. Other arguments concern the challenges involved in specifying the identity criteria of propositions. These objections are avoided by seeing premises and conclusions not as propositions but as sentences, i.e. as concrete linguistic objects like
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#17327731890419932-619: Is in line with the scatological aesthetics of Duchamp's neighbour, the Baroness Elsa von Freytag-Loringhoven . In an attempt to "pay homage to the spirit of Dada" a performance artist named Pierre Pinoncelli made a crack in a replica of The Fountain with a hammer in January 2006; he also urinated on it in 1993. Picabia's travels tied New York, Zürich and Paris groups together during the Dadaist period. For seven years he also published
10123-432: Is interested in deductively valid arguments, for which the truth of their premises ensures the truth of their conclusion. This means that it is impossible for the premises to be true and the conclusion to be false. For valid arguments, the logical structure of the premises and the conclusion follows a pattern called a rule of inference . For example, modus ponens is a rule of inference according to which all arguments of
10314-415: Is invalid in intuitionistic logic. Another classical principle not part of intuitionistic logic is the law of excluded middle . It states that for every sentence, either it or its negation is true. This means that every proposition of the form A ∨ ¬ A {\displaystyle A\lor \lnot A} is true. These deviations from classical logic are based on the idea that truth
10505-426: Is labor; and the bourgeois control of the means of coercion suppressed the sociopolitical challenges by the lower classes, and so preserved the economic status quo; workers remained workers, and employers remained employers. In the 19th century, Marx distinguished two types of bourgeois capitalist: In the course of economic relations, the working class and the bourgeoisie continually engage in class struggle , where
10696-507: Is likely that Dada's catalyst was the arrival in Zürich of artists like Tzara and Janco. The name Cabaret Voltaire was a reference to the French philosopher Voltaire , whose novel Candide mocked the religious and philosophical dogmas of the day. Opening night was attended by Ball, Tzara, Jean Arp , and Janco. These artists along with others like Sophie Taeuber , Richard Huelsenbeck and Hans Richter started putting on performances at
10887-447: Is male; Othello is not a bachelor; therefore Othello is not male". But most fallacies fall into the category of informal fallacies, of which a great variety is discussed in the academic literature. The source of their error is usually found in the content or the context of the argument. Informal fallacies are sometimes categorized as fallacies of ambiguity, fallacies of presumption, or fallacies of relevance. For fallacies of ambiguity,
11078-688: Is necessary, then it is also possible. This means that ◊ A {\displaystyle \Diamond A} follows from ◻ A {\displaystyle \Box A} . Another principle states that if a proposition is necessary then its negation is impossible and vice versa. This means that ◻ A {\displaystyle \Box A} is equivalent to ¬ ◊ ¬ A {\displaystyle \lnot \Diamond \lnot A} . Other forms of modal logic introduce similar symbols but associate different meanings with them to apply modal logic to other fields. For example, deontic logic concerns
11269-518: Is necessary. For example, if the formula B ( s ) {\displaystyle B(s)} stands for the sentence "Socrates is a banker" then the formula ◊ B ( s ) {\displaystyle \Diamond B(s)} articulates the sentence "It is possible that Socrates is a banker". To include these symbols in the logical formalism, modal logic introduces new rules of inference that govern what role they play in inferences. One rule of inference states that, if something
11460-407: Is not the best or most likely explanation. Not all arguments live up to the standards of correct reasoning. When they do not, they are usually referred to as fallacies . Their central aspect is not that their conclusion is false but that there is some flaw with the reasoning leading to this conclusion. So the argument "it is sunny today; therefore spiders have eight legs" is fallacious even though
11651-541: Is only one type of ampliative argument alongside abductive arguments . Some philosophers, like Leo Groarke, also allow conductive arguments as another type. In this narrow sense, induction is often defined as a form of statistical generalization. In this case, the premises of an inductive argument are many individual observations that all show a certain pattern. The conclusion then is a general law that this pattern always obtains. In this sense, one may infer that "all elephants are gray" based on one's past observations of
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#173277318904111842-693: Is seen as the founder of the Dada movement. The Dadaist movement included public gatherings, demonstrations, and publication of art and literary journals . Passionate coverage of art, politics, and culture were topics often discussed in a variety of media. Key figures in the movement included Jean Arp , Johannes Baader , Hugo Ball , Marcel Duchamp , Max Ernst , Elsa von Freytag-Loringhoven , George Grosz , Raoul Hausmann , John Heartfield , Emmy Hennings , Hannah Höch , Richard Huelsenbeck , Francis Picabia , Man Ray , Hans Richter , Kurt Schwitters , Sophie Taeuber-Arp , Tristan Tzara , and Beatrice Wood , among others. The movement influenced later styles like
12033-430: Is studied by formal logic. The study of natural language arguments comes with various difficulties. For example, natural language expressions are often ambiguous, vague, and context-dependent. Another approach defines informal logic in a wide sense as the normative study of the standards, criteria, and procedures of argumentation. In this sense, it includes questions about the role of rationality , critical thinking , and
12224-410: Is the set of basic symbols used in expressions . The syntactic rules determine how these symbols may be arranged to result in well-formed formulas. For instance, the syntactic rules of propositional logic determine that " P ∧ Q {\displaystyle P\land Q} " is a well-formed formula but " ∧ Q {\displaystyle \land Q} " is not since
12415-402: Is thought to be opposed to substantive forms of freedom; "bourgeois independence"; "bourgeois personal individuality"; the "bourgeois family"; et cetera, all derived from owning capital and property (see The Communist Manifesto , 1848). In English, the term bourgeoisie is often used to denote the middle classes. In fact, the French term encompasses both the upper and middle economic classes,
12606-432: Is to study the criteria according to which an argument is correct or incorrect. A fallacy is committed if these criteria are violated. In the case of formal logic, they are known as rules of inference . They are definitory rules, which determine whether an inference is correct or which inferences are allowed. Definitory rules contrast with strategic rules. Strategic rules specify which inferential moves are necessary to reach
12797-540: Is unable to address. Both provide criteria for assessing the correctness of arguments and distinguishing them from fallacies. Many characterizations of informal logic have been suggested but there is no general agreement on its precise definition. The most literal approach sees the terms "formal" and "informal" as applying to the language used to express arguments. On this view, informal logic studies arguments that are in informal or natural language. Formal logic can only examine them indirectly by translating them first into
12988-599: Is used to represent the ideas of knowing something in contrast to merely believing it to be the case. Higher-order logics extend classical logic not by using modal operators but by introducing new forms of quantification. Quantifiers correspond to terms like "all" or "some". In classical first-order logic, quantifiers are only applied to individuals. The formula " ∃ x ( A p p l e ( x ) ∧ S w e e t ( x ) ) {\displaystyle \exists x(Apple(x)\land Sweet(x))} " ( some apples are sweet)
13179-431: Is why first-order logic is still more commonly used. Deviant logics are logical systems that reject some of the basic intuitions of classical logic. Because of this, they are usually seen not as its supplements but as its rivals. Deviant logical systems differ from each other either because they reject different classical intuitions or because they propose different alternatives to the same issue. Intuitionistic logic
13370-407: The haute bourgeoisie (bankers and industrialists) and the petite bourgeoisie ( tradesmen and white-collar workers ). Moreover, by the end of the 19th century, the capitalists (the original bourgeoisie) had ascended to the upper class, while the developments of technology and technical occupations allowed the rise of working-class men and women to the lower strata of the bourgeoisie; yet
13561-696: The Cabaret Voltaire (housed inside the Holländische Meierei bar in Zürich) co-founded by poet and cabaret singer Emmy Hennings and Hugo Ball . Some sources propose a Romanian origin, arguing that Dada was an offshoot of a vibrant artistic tradition that transposed to Switzerland when a group of Jewish modernist artists, including Tristan Tzara, Marcel Janco , and Arthur Segal settled in Zürich. Before World War I, similar art had already existed in Bucharest and other Eastern European cities; it
13752-618: The Late Middle Ages , originally as a " middle class " between peasantry and aristocracy . They are traditionally contrasted with the proletariat by their wealth, political power, and education, as well as their access to and control of cultural , social , and financial capital . The bourgeoisie in its original sense is intimately linked to the political ideology of liberalism and its existence within cities, recognised as such by their urban charters (e.g., municipal charters , town privileges , German town law ), so there
13943-886: The Old French borgeis or borjois ('town dweller'), which derived from bourg (' market town '), from the Old Frankish burg ('town'); in other European languages, the etymologic derivations include the Middle English burgeis , the Middle Dutch burgher , the German Bürger , the Modern English burgess , the Spanish burgués , the Portuguese burguês , and
14134-544: The absolute monarchy of the Bourbon King Louis XVI (r. 1774–1791), his clergy, and his aristocrats in the French Revolution of 1789–1799. Hence, since the 19th century, the term "bourgeoisie" usually is politically and sociologically synonymous with the ruling upper class of a capitalist society. In English, the word "bourgeoisie", as a term referring to French history, refers to
14325-461: The left nor the right , but preserved "pure" elements from both "camps", stating: "From the camp of bourgeois tradition, it takes national resolve, and from the materialism of the Marxist dogma, living, creative Socialism." Hitler distrusted capitalism for being unreliable due to its egotism , and he preferred a state-directed economy that is subordinated to the interests of the Volk . Hitler told
14516-407: The left-wing and far-left politics . The movement had no shared artistic style , although most artists had shown interest in the machine aesthetic . There is no consensus on the origin of the movement's name; a common story is that the artist Richard Huelsenbeck slid a paper knife randomly into a dictionary, where it landed on "dada", a French term for a hobby horse . Others note it suggests
14707-458: The 11th century when the bourgs of Central and Western Europe developed into cities dedicated to commerce and crafts. This urban expansion was possible thanks to economic concentration due to the appearance of protective self-organization into guilds . Guilds arose when individual businessmen (such as craftsmen, artisans and merchants) conflicted with their rent-seeking feudal landlords who demanded greater rents than previously agreed. In
14898-444: The 1920s. "Berlin was a city of tightened stomachers, of mounting, thundering hunger, where hidden rage was transformed into a boundless money lust, and men's minds were concentrating more and more on questions of naked existence... Fear was in everybody's bones" – Richard Hülsenbeck Raoul Hausmann , who helped establish Dada in Berlin, published his manifesto Synthethic Cino of Painting in 1918 where he attacked Expressionism and
15089-526: The Buddenbrook family fortune, occasionally falters from middle-class solidity by being interested in art and philosophy, the impractical life of the mind , which, to the bourgeoisie, is the epitome of social, moral, and material decadence. Babbitt (1922), by Sinclair Lewis (1885–1951), satirizes the American bourgeois George Follansbee Babbitt, a middle-aged realtor , booster , and joiner in
15280-498: The Cabaret Voltaire and using art to express their disgust with the war and the interests that inspired it. Having left Germany and Romania during World War I , the artists arrived in politically neutral Switzerland. They used abstraction to fight against the social, political, and cultural ideas of that time. They used shock art , provocation, and " vaudevillian excess" to subvert the conventions they believed had caused
15471-691: The Dada periodical 391 in Barcelona, New York City, Zürich, and Paris from 1917 through 1924. By 1921, most of the original players moved to Paris where Dada had experienced its last major incarnation. The French avant-garde kept abreast of Dada activities in Zürich with regular communications from Tristan Tzara (whose pseudonym means "sad in country," a name chosen to protest the treatment of Jews in his native Romania), who exchanged letters, poems, and magazines with Guillaume Apollinaire , André Breton , Max Jacob , Clément Pansaers , and other French writers, critics and artists. Paris had arguably been
15662-492: The Great War. The Dadaists believed those ideas to be a byproduct of bourgeois society that was so apathetic it would wage war against itself rather than challenge the status quo : We had lost confidence in our culture. Everything had to be demolished. We would begin again after the tabula rasa . At the Cabaret Voltaire we began by shocking common sense, public opinion, education, institutions, museums, good taste, in short,
15853-469: The Greek word "logos", which has a variety of translations, such as reason , discourse , or language . Logic is traditionally defined as the study of the laws of thought or correct reasoning , and is usually understood in terms of inferences or arguments . Reasoning is the activity of drawing inferences. Arguments are the outward expression of inferences. An argument is a set of premises together with
16044-497: The Marxist use of the term "bourgeois" also describes the consumerist style of life derived from the ownership of capital and real property . Marx acknowledged the bourgeois industriousness that created wealth, but criticised the moral hypocrisy of the bourgeoisie when they ignored the alleged origins of their wealth: the exploitation of the proletariat, the urban and rural workers. Further sense denotations of "bourgeois" describe ideological concepts such as "bourgeois freedom", which
16235-517: The Midwestern city of Zenith, who – despite being unimaginative, self-important, and hopelessly conformist and middle-class – is aware that there must be more to life than money and the consumption of the best things that money can buy. Nevertheless, he fears being excluded from the mainstream of society more than he does living for himself, by being true to himself – his heart-felt flirtations with independence (dabbling in liberal politics and
16426-534: The Mussolini fascist régime transcended ideology to merge the political and financial interests of Prime Minister Benito Mussolini with the political and financial interests of the bourgeoisie, the Catholic social circles who constituted the ruling class of Italy. Philosophically, as a materialist creature, the bourgeois man was stereotyped as irreligious; thus, to establish an existential distinction between
16617-535: The Parisian public was at the Salon des Indépendants in 1921. Jean Crotti exhibited works associated with Dada including a work entitled, Explicatif bearing the word Tabu . In the same year Tzara staged his Dadaist play The Gas Heart to howls of derision from the audience. When it was re-staged in 1923 in a more professional production, the play provoked a theatre riot (initiated by André Breton ) that heralded
16808-550: The Polish burżuazja , which occasionally is synonymous with the intelligentsia . In the 18th century, before the French Revolution (1789–1799), in the French Ancien Régime , the masculine and feminine terms bourgeois and bourgeoise identified the relatively rich men and women who were members of the urban and rural Third Estate – the common people of the French realm , who violently deposed
16999-541: The abolition of everything"; and "members intoxicated with their own power in a way that had no relation to the real world", who would "turn their rebelliousness even against each other". In February 1918, while the Great War was approaching its climax, Huelsenbeck gave his first Dada speech in Berlin, and he produced a Dada manifesto later in the year. Following the October Revolution in Russia , by then out of
17190-418: The ambiguity and vagueness of natural language are responsible for their flaw, as in "feathers are light; what is light cannot be dark; therefore feathers cannot be dark". Fallacies of presumption have a wrong or unjustified premise but may be valid otherwise. In the case of fallacies of relevance, the premises do not support the conclusion because they are not relevant to it. The main focus of most logicians
17381-464: The art critics who promoted it. Dada is envisioned in contrast to art forms, such as Expressionism, that appeal to viewers' emotional states: "the exploitation of so-called echoes of the soul". In Hausmann's conception of Dada, new techniques of creating art would open doors to explore new artistic impulses. Fragmented use of real world stimuli allowed an expression of reality that was radically different from other forms of art: A child's discarded doll or
17572-399: The assessment of arguments. Premises and conclusions are the basic parts of inferences or arguments and therefore play a central role in logic. In the case of a valid inference or a correct argument, the conclusion follows from the premises, or in other words, the premises support the conclusion. For instance, the premises "Mars is red" and "Mars is a planet" support the conclusion "Mars
17763-514: The audience, the provocations of Dadaists began to lose their impact. Dada was an active movement during years of political turmoil from 1916 when European countries were actively engaged in World War I, the conclusion of which, in 1918, set the stage for a new political order. There is some disagreement about where Dada originated. The movement is commonly accepted by most art historians and those who lived during this period to have identified with
17954-495: The avant-garde and downtown music movements, and groups including Surrealism , nouveau réalisme , pop art , and Fluxus . Dada was an informal international movement, with participants in Europe and North America. The beginnings of Dada correspond with the outbreak of World War I. For many participants, the movement was a protest against the bourgeois nationalist and colonialist interests, which many Dadaists believed were
18145-414: The average man compensates with cunning, schemes, and mischief; he kicks out ethics, and becomes a bourgeois. The bourgeois is the average man who does not accept to remain such, and who, lacking the strength sufficient for the conquest of essential values—those of the spirit—opts for material ones, for appearances. The economic security, financial freedom , and social mobility of the bourgeoisie threatened
18336-495: The basic principles of classical logic. They introduce additional symbols and principles to apply it to fields like metaphysics , ethics , and epistemology . Modal logic is an extension of classical logic. In its original form, sometimes called "alethic modal logic", it introduces two new symbols: ◊ {\displaystyle \Diamond } expresses that something is possible while ◻ {\displaystyle \Box } expresses that something
18527-487: The best explanation, for example, when a doctor concludes that a patient has a certain disease which explains the symptoms they suffer. Arguments that fall short of the standards of correct reasoning often embody fallacies . Systems of logic are theoretical frameworks for assessing the correctness of arguments. Logic has been studied since antiquity . Early approaches include Aristotelian logic , Stoic logic , Nyaya , and Mohism . Aristotelian logic focuses on reasoning in
18718-464: The bourgeois mentality by the German intellectual Walter Benjamin (1892–1940) indicated that the shop culture of the petite bourgeoisie established the sitting room as the center of personal and family life; as such, the English bourgeois culture is, he alleges, a sitting-room culture of prestige through conspicuous consumption . The material culture of the bourgeoisie concentrated on mass-produced luxury goods of high quality; between generations,
18909-533: The bourgeois mentality: (i) the shop-window display, and (ii) the sitting room. In English, the term "sitting-room culture" is synonymous for "bourgeois mentality", a " philistine " cultural perspective from the Victorian Era (1837–1901), especially characterized by the repression of emotion and of sexual desire; and by the construction of a regulated social-space where " propriety " is the key personality trait desired in men and women. Nonetheless, from such
19100-411: The bourgeoisie had become the economic ruling class who owned the means of production (capital and land), and who controlled the means of coercion (armed forces and legal system, police forces and prison system). In such a society, the bourgeoisie's ownership of the means of production allowed them to employ and exploit the wage-earning working class (urban and rural), people whose only economic means
19291-402: The capitalists exploit the workers, while the workers resist their economic exploitation, which occurs because the worker owns no means of production, and, to earn a living, seeks employment from the bourgeois capitalist; the worker produces goods and services that are property of the employer, who sells them for a price. Besides describing the social class who owns the means of production ,
19482-496: The chaotic nature of society. Tristan Tzara proclaimed, "Everything is Dada, too. Beware of Dada. Anti-dadaism is a disease: selfkleptomania, man's normal condition, is Dada. But the real Dadas are against Dada". As Hugo Ball expressed it, "For us, art is not an end in itself ... but it is an opportunity for the true perception and criticism of the times we live in." A reviewer from the American Art News stated at
19673-645: The claim "either it is raining, or it is not". These two definitions of formal logic are not identical, but they are closely related. For example, if the inference from p to q is deductively valid then the claim "if p then q " is a logical truth. Formal logic uses formal languages to express and analyze arguments. They normally have a very limited vocabulary and exact syntactic rules . These rules specify how their symbols can be combined to construct sentences, so-called well-formed formulas . This simplicity and exactness of formal logic make it capable of formulating precise rules of inference. They determine whether
19864-468: The claims of rule by divine right that the nobles and prelates had autonomously exercised during the feudal order. The English Civil War (1642–1651), the American War of Independence (1775–1783), and French Revolution (1789–1799) were partly motivated by the desire of the bourgeoisie to rid themselves of the feudal and royal encroachments on their personal liberty, commercial prospects, and
20055-492: The classical music capital of the world since the advent of musical Impressionism in the late 19th century. One of its practitioners, Erik Satie , collaborated with Picasso and Cocteau in a mad, scandalous ballet called Parade . First performed by the Ballets Russes in 1917, it succeeded in creating a scandal but in a different way than Stravinsky's Le Sacre du printemps had done almost five years earlier. This
20246-495: The color of elephants. A closely related form of inductive inference has as its conclusion not a general law but one more specific instance, as when it is inferred that an elephant one has not seen yet is also gray. Some theorists, like Igor Douven, stipulate that inductive inferences rest only on statistical considerations. This way, they can be distinguished from abductive inference. Abductive inference may or may not take statistical observations into consideration. In either case,
20437-511: The conclusion "all ravens are black". A further approach is to define informal logic as the study of informal fallacies . Informal fallacies are incorrect arguments in which errors are present in the content and the context of the argument. A false dilemma , for example, involves an error of content by excluding viable options. This is the case in the fallacy "you are either with us or against us; you are not with us; therefore, you are against us". Some theorists state that formal logic studies
20628-458: The conclusion is true. Some theorists, like John Stuart Mill , give a more restrictive definition of fallacies by additionally requiring that they appear to be correct. This way, genuine fallacies can be distinguished from mere mistakes of reasoning due to carelessness. This explains why people tend to commit fallacies: because they have an alluring element that seduces people into committing and accepting them. However, this reference to appearances
20819-591: The conditional proposition p → q {\displaystyle p\to q} , one can form truth tables of its converse q → p {\displaystyle q\to p} , its inverse ( ¬ p → ¬ q {\displaystyle \lnot p\to \lnot q} ) , and its contrapositive ( ¬ q → ¬ p {\displaystyle \lnot q\to \lnot p} ) . Truth tables can also be defined for more complex expressions that use several propositional connectives. Logic
21010-546: The continual striving for prestige . This being the case, the cultures of the world describe the philistinism of the middle-class personality, produced by the excessively rich life of the bourgeoisie, is examined and analyzed in comedic and dramatic plays, novels, and films (see Authenticity ). The term bourgeoisie has been used as a pejorative and a term of abuse since the 19th century, particularly by intellectuals and artists. Le Bourgeois gentilhomme (The Would-be Gentleman, 1670) by Molière (Jean-Baptiste Poquelin),
21201-438: The contrast between necessity and possibility and the problem of ethical obligation and permission. Similarly, it does not address the relations between past, present, and future. Such issues are addressed by extended logics. They build on the basic intuitions of classical logic and expand it by introducing new logical vocabulary. This way, the exact logical approach is applied to fields like ethics or epistemology that lie beyond
21392-432: The degree that they practice the mores of the small-business "shop culture" of early modern France; which the writer Émile Zola (1840–1902) naturalistically presented, analyzed, and ridiculed in the twenty-two-novel series (1871–1893) about Les Rougon-Macquart family; the thematic thrust is the necessity for social progress, by subordinating the economic sphere to the social sphere of life. The critical analyses of
21583-451: The depth level. But they can be highly informative on the surface level by making implicit information explicit. This happens, for example, in mathematical proofs. Ampliative arguments are arguments whose conclusions contain additional information not found in their premises. In this regard, they are more interesting since they contain information on the depth level and the thinker may learn something genuinely new. But this feature comes with
21774-594: The development of collage and abstract art would inform the movement's detachment from the constraints of reality and convention. The work of French poets, Italian Futurists , and German Expressionists would influence Dada's rejection of the correlation between words and meaning. Works such as Ubu Roi (1896) by Alfred Jarry and the ballet Parade (1916–17) by Erik Satie would be characterized as proto-Dadaist works. The Dada movement's principles were first collected in Hugo Ball 's Dada Manifesto in 1916. Ball
21965-467: The development of the bourgs into cities. Contemporarily, the terms "bourgeoisie" and "bourgeois" (noun) identify the "ruling class" in capitalist societies, as a social stratum; while "bourgeois" (adjective / noun modifier) describes the Weltanschauung ( worldview ) of men and women whose way of thinking is socially and culturally determined by their economic materialism and philistinism ,
22156-460: The event, by the end of the Middle Ages ( c. AD 1500 ), under regimes of the early national monarchies of Western Europe, the bourgeoisie acted in self-interest, and politically supported the king or queen against legal and financial disorder caused by the greed of the feudal lords. In the late-16th and early 17th centuries, the bourgeoisies of England and the Netherlands had become
22347-409: The example. The truth of a proposition usually depends on the meanings of all of its parts. However, this is not the case for logically true propositions. They are true only because of their logical structure independent of the specific meanings of the individual parts. Arguments can be either correct or incorrect. An argument is correct if its premises support its conclusion. Deductive arguments have
22538-478: The fascist Italian state and "The People"; as a social class who drained the human potential of Italian society, in general, and of the working class, in particular; as exploiters who victimized the Italian nation with an approach to life characterized by hedonism and materialism . Nevertheless, despite the slogan The Fascist Man Disdains the "Comfortable" Life , which epitomized the anti-bourgeois principle, in its final years of power, for mutual benefit and profit,
22729-434: The field of ethics and introduces symbols to express the ideas of obligation and permission , i.e. to describe whether an agent has to perform a certain action or is allowed to perform it. The modal operators in temporal modal logic articulate temporal relations. They can be used to express, for example, that something happened at one time or that something is happening all the time. In epistemology, epistemic modal logic
22920-616: The final two from Paris. Other artists, such as André Breton and Philippe Soupault , created "literature groups to help extend the influence of Dada". After the fighting of the First World War had ended in the armistice of November 1918, most of the Zürich Dadaists returned to their home countries, and some began Dada activities in other cities. Others, such as the Swiss native Sophie Taeuber , would remain in Zürich into
23111-455: The financial – thus political – forces that deposed the feudal order; economic power had vanquished military power in the realm of politics. According to the Marxist view of history, during the 17th and 18th centuries, the bourgeoisie were the politically progressive social class who supported the principles of constitutional government and of natural right , against the Law of Privilege and
23302-466: The first words of a child, evoking a childishness and absurdity that appealed to the group. Still others speculate it might have been chosen to evoke a similar meaning (or no meaning at all) in any language, reflecting the movement's internationalism . The roots of Dada lie in pre-war avant-garde. The term anti-art , a precursor to Dada, was coined by Marcel Duchamp around 1913 to characterize works that challenge accepted definitions of art. Cubism and
23493-485: The form "(1) p , (2) if p then q , (3) therefore q " are valid, independent of what the terms p and q stand for. In this sense, formal logic can be defined as the science of valid inferences. An alternative definition sees logic as the study of logical truths . A proposition is logically true if its truth depends only on the logical vocabulary used in it. This means that it is true in all possible worlds and under all interpretations of its non-logical terms, like
23684-513: The form of syllogisms . It was considered the main system of logic in the Western world until it was replaced by modern formal logic, which has its roots in the work of late 19th-century mathematicians such as Gottlob Frege . Today, the most commonly used system is classical logic . It consists of propositional logic and first-order logic . Propositional logic only considers logical relations between full propositions. First-order logic also takes
23875-523: The form of the premises and the conclusion: how they have to be structured for the inference to be valid. Arguments that do not follow any rule of inference are deductively invalid. The modus ponens is a prominent rule of inference. It has the form " p ; if p , then q ; therefore q ". Knowing that it has just rained ( p {\displaystyle p} ) and that after rain the streets are wet ( p → q {\displaystyle p\to q} ), one can use modus ponens to deduce that
24066-419: The form of the premises and the conclusion; (2) they are a priori, i.e. no sense experience is needed to determine whether they obtain; (3) they are modal, i.e. that they hold by logical necessity for the given propositions, independent of any other circumstances. Because of the first feature, the focus on formality, deductive inference is usually identified with rules of inference. Rules of inference specify
24257-421: The general form of arguments while informal logic studies particular instances of arguments. Another approach is to hold that formal logic only considers the role of logical constants for correct inferences while informal logic also takes the meaning of substantive concepts into account. Further approaches focus on the discussion of logical topics with or without formal devices and on the role of epistemology for
24448-406: The internal parts of propositions into account, like predicates and quantifiers . Extended logics accept the basic intuitions behind classical logic and apply it to other fields, such as metaphysics , ethics , and epistemology . Deviant logics, on the other hand, reject certain classical intuitions and provide alternative explanations of the basic laws of logic. The word "logic" originates from
24639-407: The internal structure of propositions. This happens through devices such as singular terms, which refer to particular objects, predicates , which refer to properties and relations, and quantifiers, which treat notions like "some" and "all". For example, to express the proposition "this raven is black", one may use the predicate B {\displaystyle B} for the property "black" and
24830-464: The latter part of the 19th century, the bourgeois house contained a home that had been remodeled by conspicuous consumption. Here, Benjamin argues, the goods were bought to display wealth ( discretionary income ), rather than for their practical utility. The bourgeoisie had transposed the wares of the shop window to the sitting room, where the clutter of display signaled bourgeois success (see Culture and Anarchy , 1869). Two spatial constructs manifest
25021-482: The liminal exhibitions at the Café Voltaire in Zürich, and Paul Citroen . Logic Logic is the study of correct reasoning . It includes both formal and informal logic . Formal logic is the study of deductively valid inferences or logical truths . It examines how conclusions follow from premises based on the structure of arguments alone, independent of their topic and content. Informal logic
25212-522: The logical conjunction ∧ {\displaystyle \land } requires terms on both sides. A proof system is a collection of rules to construct formal proofs. It is a tool to arrive at conclusions from a set of axioms. Rules in a proof system are defined in terms of the syntactic form of formulas independent of their specific content. For instance, the classical rule of conjunction introduction states that P ∧ Q {\displaystyle P\land Q} follows from
25403-402: The machinations of Picabia, re-cast Dada's history. Dada's European chroniclers—primarily Richter, Tzara, and Huelsenbeck—would eventually become preoccupied with establishing the pre-eminence of Zürich and Berlin at the foundations of Dada, but it proved to be Duchamp who was most strategically brilliant in manipulating the genealogy of this avant-garde formation, deftly turning New York Dada from
25594-490: The middle class and the lower class: the lower middle class". Nazism rejected the Marxist concept of proletarian internationalism and class struggle , and supported the "class struggle between nations", and sought to resolve internal class struggle in the nation while it identified Germany as a proletariat nation fighting against plutocratic nations. The Nazi Party had many working-class supporters and members, and
25785-527: The name "Dada" came during a meeting of the group when a paper knife stuck into a French–German dictionary happened to point to 'dada', a French word for ' hobbyhorse '. The movement primarily involved visual arts , literature , poetry , art manifestos , art theory , theatre , and graphic design , and concentrated its anti-war politics through a rejection of the prevailing standards in art through anti-art cultural works. The creations of Duchamp, Picabia, Man Ray, and others between 1915 and 1917 eluded
25976-408: The only variance was the materials with which the goods were manufactured. In the early part of the 19th century, the bourgeois house contained a home that first was stocked and decorated with hand-painted porcelain , machine-printed cotton fabrics, machine-printed wallpaper , and Sheffield steel ( crucible and stainless ). The utility of these things was inherent in their practical functions. By
26167-409: The other hand, are true or false depending on whether they are in accord with reality. In formal logic, a sound argument is an argument that is both correct and has only true premises. Sometimes a distinction is made between simple and complex arguments. A complex argument is made up of a chain of simple arguments. This means that the conclusion of one argument acts as a premise of later arguments. For
26358-444: The other hand, do not have propositional parts. But they can also be conceived as having an internal structure: they are made up of subpropositional parts, like singular terms and predicates . For example, the simple proposition "Mars is red" can be formed by applying the predicate "red" to the singular term "Mars". In contrast, the complex proposition "Mars is red and Venus is white" is made up of two simple propositions connected by
26549-577: The ownership of property . In the 19th century, the bourgeoisie propounded liberalism , and gained political rights, religious rights, and civil liberties for themselves and the lower social classes; thus the bourgeoisie was a progressive philosophic and political force in Western societies. After the Industrial Revolution (1750–1850), by the mid-19th century the great expansion of the bourgeoisie social class caused its stratification – by business activity and by economic function – into
26740-424: The peasants and the landlords, between the workers and the owners of the means of production , the feudal nobility . As the economic managers of the (raw) materials, the goods, and the services, and thus the capital (money) produced by the feudal economy, the term "bourgeoisie" evolved to also denote the middle class – the businessmen who accumulated, administered, and controlled the capital that made possible
26931-402: The philosophic integrity of Italian fascism, the ideological monolith that was the régime of Prime Minister Benito Mussolini. Any assumption of legitimate political power (government and rule) by the bourgeoisie represented a fascist loss of totalitarian state power for social control through political unity—one people, one nation, and one leader. Sociologically, to the fascist man, to become
27122-473: The postwar economic and moral crisis, a savior, a monster, which would lay waste to everything in its path... [It was] a systematic work of destruction and demoralization... In the end it became nothing but an act of sacrilege." To quote Dona Budd's The Language of Art Knowledge , Dada was born out of negative reaction to the horrors of the First World War . This international movement was begun by
27313-485: The premises P {\displaystyle P} and Q {\displaystyle Q} . Such rules can be applied sequentially, giving a mechanical procedure for generating conclusions from premises. There are different types of proof systems including natural deduction and sequent calculi . A semantics is a system for mapping expressions of a formal language to their denotations. In many systems of logic, denotations are truth values. For instance,
27504-413: The premises offer support for the conclusion because the conclusion is the best explanation of why the premises are true. In this sense, abduction is also called the inference to the best explanation . For example, given the premise that there is a plate with breadcrumbs in the kitchen in the early morning, one may infer the conclusion that one's house-mate had a midnight snack and was too tired to clean
27695-470: The premises. But this point is not always accepted since it would mean, for example, that most of mathematics is uninformative. A different characterization distinguishes between surface and depth information. The surface information of a sentence is the information it presents explicitly. Depth information is the totality of the information contained in the sentence, both explicitly and implicitly. According to this view, deductive inferences are uninformative on
27886-451: The private life of his daughter, so that her marriage can also assist his social ascent. Buddenbrooks (1901), by Thomas Mann (1875–1955), chronicles the moral , intellectual, and physical decay of a rich family through its declines, material and spiritual, in the course of four generations, beginning with the patriarch Johann Buddenbrook Sr. and his son, Johann Buddenbrook Jr., who are typically successful German businessmen; each
28077-485: The propositional connective "and". Whether a proposition is true depends, at least in part, on its constituents. For complex propositions formed using truth-functional propositional connectives, their truth only depends on the truth values of their parts. But this relation is more complicated in the case of simple propositions and their subpropositional parts. These subpropositional parts have meanings of their own, like referring to objects or classes of objects. Whether
28268-406: The propositions are formed. For example, the syllogism "all men are mortal; Socrates is a man; therefore Socrates is mortal" is valid. The syllogism "all cats are mortal; Socrates is mortal; therefore Socrates is a cat", on the other hand, is invalid. Classical logic is distinct from traditional or Aristotelian logic. It encompasses propositional logic and first-order logic. It is "classical" in
28459-417: The psychology of argumentation. Another characterization identifies informal logic with the study of non-deductive arguments. In this way, it contrasts with deductive reasoning examined by formal logic. Non-deductive arguments make their conclusion probable but do not ensure that it is true. An example is the inductive argument from the empirical observation that "all ravens I have seen so far are black" to
28650-795: The root cause of the war, and against the cultural and intellectual conformity—in art and more broadly in society—that corresponded to the war. Avant-garde circles outside France knew of pre-war Parisian developments. They had seen (or participated in) Cubist exhibitions held at Galeries Dalmau , Barcelona (1912), Galerie Der Sturm in Berlin (1912), the Armory Show in New York (1913), SVU Mánes in Prague (1914), several Jack of Diamonds exhibitions in Moscow and at Moderne Kunstkring , Amsterdam (between 1911 and 1915). Futurism developed in response to
28841-436: The rules of inference they accept as valid and the formal languages used to express them. Starting in the late 19th century, many new formal systems have been proposed. There are disagreements about what makes a formal system a logic. For example, it has been suggested that only logically complete systems, like first-order logic , qualify as logics. For such reasons, some theorists deny that higher-order logics are logics in
29032-492: The scope of mathematics. Propositional logic comprises formal systems in which formulae are built from atomic propositions using logical connectives . For instance, propositional logic represents the conjunction of two atomic propositions P {\displaystyle P} and Q {\displaystyle Q} as the complex formula P ∧ Q {\displaystyle P\land Q} . Unlike predicate logic where terms and predicates are
29223-418: The semantics for classical propositional logic assigns the formula P ∧ Q {\displaystyle P\land Q} the denotation "true" whenever P {\displaystyle P} and Q {\displaystyle Q} are true. From the semantic point of view, a premise entails a conclusion if the conclusion is true whenever the premise is true. A system of logic
29414-604: The semantics. Thus, soundness and completeness together describe a system whose notions of validity and entailment line up perfectly. Systems of logic are theoretical frameworks for assessing the correctness of reasoning and arguments. For over two thousand years, Aristotelian logic was treated as the canon of logic in the Western world, but modern developments in this field have led to a vast proliferation of logical systems. One prominent categorization divides modern formal logical systems into classical logic , extended logics, and deviant logics . Aristotelian logic encompasses
29605-518: The sense that it is based on basic logical intuitions shared by most logicians. These intuitions include the law of excluded middle , the double negation elimination , the principle of explosion , and the bivalence of truth. It was originally developed to analyze mathematical arguments and was only later applied to other fields as well. Because of this focus on mathematics, it does not include logical vocabulary relevant to many other topics of philosophical importance. Examples of concepts it overlooks are
29796-404: The simple proposition "Mars is red", are true or false. In such cases, the truth is called a logical truth: a proposition is logically true if its truth depends only on the logical vocabulary used in it. This means that it is true under all interpretations of its non-logical terms. In some modal logics , this means that the proposition is true in all possible worlds. Some theorists define logic as
29987-415: The simple proposition they form is true depends on their relation to reality, i.e. what the objects they refer to are like. This topic is studied by theories of reference . Some complex propositions are true independently of the substantive meanings of their parts. In classical logic, for example, the complex proposition "either Mars is red or Mars is not red" is true independent of whether its parts, like
30178-870: The singular term r {\displaystyle r} referring to the raven to form the expression B ( r ) {\displaystyle B(r)} . To express that some objects are black, the existential quantifier ∃ {\displaystyle \exists } is combined with the variable x {\displaystyle x} to form the proposition ∃ x B ( x ) {\displaystyle \exists xB(x)} . First-order logic contains various rules of inference that determine how expressions articulated this way can form valid arguments, for example, that one may infer ∃ x B ( x ) {\displaystyle \exists xB(x)} from B ( r ) {\displaystyle B(r)} . Extended logics are logical systems that accept
30369-474: The smallest units, propositional logic takes full propositions with truth values as its most basic component. Thus, propositional logics can only represent logical relationships that arise from the way complex propositions are built from simpler ones. But it cannot represent inferences that result from the inner structure of a proposition. First-order logic includes the same propositional connectives as propositional logic but differs from it because it articulates
30560-543: The so-called Dutch Dada campaign in 1923, where van Doesburg promoted a leaflet about Dada (entitled What is Dada? ), Schwitters read his poems, Vilmos Huszár demonstrated a mechanical dancing doll and Nelly van Doesburg (Theo's wife), played avant-garde compositions on piano. Van Doesburg wrote Dada poetry himself in De Stijl , although under a pseudonym, I.K. Bonset, which was only revealed after his death in 1931. 'Together' with I.K. Bonset, he also published
30751-515: The social progress was incidental. According to Karl Marx , the bourgeois during the Middle Ages usually was a self-employed businessman – such as a merchant, banker, or entrepreneur – whose economic role in society was being the financial intermediary to the feudal landlord and the peasant who worked the fief , the land of the lord. Yet, by the 18th century, the time of the Industrial Revolution (1750–1850) and of industrial capitalism,
30942-761: The split within the movement that was to produce Surrealism . Tzara's last attempt at a Dadaist drama was his " ironic tragedy " Handkerchief of Clouds in 1924. In the Netherlands the Dada movement centered mainly around Theo van Doesburg , best known for establishing the De Stijl movement and magazine of the same name. Van Doesburg mainly focused on poetry, and included poems from many well-known Dada writers in De Stijl such as Hugo Ball , Hans Arp and Kurt Schwitters . Van Doesburg and Thijs Rinsema [ nl ] (a cordwainer and artist in Drachten ) became friends of Schwitters, and together they organized
31133-422: The sponsors of the 2004 Turner Prize , Gordon's gin, voted it "the most influential work of modern art". As recent scholarship documents, the work is still controversial. Duchamp indicated in a 1917 letter to his sister that a female friend was centrally involved in the conception of this work: "One of my female friends who had adopted the pseudonym Richard Mutt sent me a porcelain urinal as a sculpture." The piece
31324-418: The streets are wet ( q {\displaystyle q} ). The third feature can be expressed by stating that deductively valid inferences are truth-preserving: it is impossible for the premises to be true and the conclusion to be false. Because of this feature, it is often asserted that deductive inferences are uninformative since the conclusion cannot arrive at new information not already present in
31515-437: The strict sense. When understood in a wide sense, logic encompasses both formal and informal logic. Informal logic uses non-formal criteria and standards to analyze and assess the correctness of arguments. Its main focus is on everyday discourse. Its development was prompted by difficulties in applying the insights of formal logic to natural language arguments. In this regard, it considers problems that formal logic on its own
31706-550: The strongest form of support: if their premises are true then their conclusion must also be true. This is not the case for ampliative arguments, which arrive at genuinely new information not found in the premises. Many arguments in everyday discourse and the sciences are ampliative arguments. They are divided into inductive and abductive arguments. Inductive arguments are statistical generalizations, such as inferring that all ravens are black based on many individual observations of black ravens. Abductive arguments are inferences to
31897-438: The study of logical truths. Truth tables can be used to show how logical connectives work or how the truth values of complex propositions depends on their parts. They have a column for each input variable. Each row corresponds to one possible combination of the truth values these variables can take; for truth tables presented in the English literature, the symbols "T" and "F" or "1" and "0" are commonly used as abbreviations for
32088-700: The subject in two ways: either by affirming it or by denying it. For example, the proposition "Socrates is not a cat" involves the denial of the predicate "cat" to the subject "Socrates". Using combinations of subjects and predicates, a great variety of propositions and syllogisms can be formed. Syllogisms are characterized by the fact that the premises are linked to each other and to the conclusion by sharing one predicate in each case. Thus, these three propositions contain three predicates, referred to as major term , minor term , and middle term . The central aspect of Aristotelian logic involves classifying all possible syllogisms into valid and invalid arguments according to how
32279-417: The subject to the predicate. For example, the proposition "Socrates is wise" is made up of the subject "Socrates", the predicate "wise", and the copula "is". The subject and the predicate are the terms of the proposition. Aristotelian logic does not contain complex propositions made up of simple propositions. It differs in this aspect from propositional logic, in which any two propositions can be linked using
32470-561: The supernatural faith of the Roman Catholic Church and the materialist faith of temporal religion; in The Autarchy of Culture: Intellectuals and Fascism in the 1930s , the priest Giuseppe Marino said that: Christianity is essentially anti-bourgeois. ... A Christian, a true Christian, and thus a Catholic, is the opposite of a bourgeois. Culturally, the bourgeois man may be considered effeminate, infantile, or acting in
32661-423: The symbols displayed on a page of a book. But this approach comes with new problems of its own: sentences are often context-dependent and ambiguous, meaning an argument's validity would not only depend on its parts but also on its context and on how it is interpreted. Another approach is to understand premises and conclusions in psychological terms as thoughts or judgments. This position is known as psychologism . It
32852-409: The table. This conclusion is justified because it is the best explanation of the current state of the kitchen. For abduction, it is not sufficient that the conclusion explains the premises. For example, the conclusion that a burglar broke into the house last night, got hungry on the job, and had a midnight snack, would also explain the state of the kitchen. But this conclusion is not justified because it
33043-399: The term ampliative or inductive reasoning is used. Deductive arguments are associated with formal logic in contrast to the relation between ampliative arguments and informal logic. A deductively valid argument is one whose premises guarantee the truth of its conclusion. For instance, the argument "(1) all frogs are amphibians; (2) no cats are amphibians; (3) therefore no cats are frogs"
33234-427: The term Dada at the time, and " New York Dada " came to be seen as a post facto invention of Duchamp. At the outset of the 1920s the term Dada flourished in Europe with the help of Duchamp and Picabia, who had both returned from New York. Notwithstanding, Dadaists such as Tzara and Richter claimed European precedence. Art historian David Hopkins notes: Ironically, though, Duchamp's late activities in New York, along with
33425-409: The time that "Dada philosophy is the sickest, most paralyzing and most destructive thing that has ever originated from the brain of man." Art historians have described Dada as being, in large part, a "reaction to what many of these artists saw as nothing more than an insane spectacle of collective homicide". Years later, Dada artists described the movement as "a phenomenon bursting forth in the midst of
33616-450: The traditionalist basis for museum art. New York Dada lacked the disillusionment of European Dada and was instead driven by a sense of irony and humor. In his book Adventures in the arts: informal chapters on painters, vaudeville and poets Marsden Hartley included an essay on " The Importance of Being 'Dada' ". During this time Duchamp began exhibiting " readymades " (everyday objects found or purchased and declared art) such as
33807-479: The truth values "true" and "false". The first columns present all the possible truth-value combinations for the input variables. Entries in the other columns present the truth values of the corresponding expressions as determined by the input values. For example, the expression " p ∧ q {\displaystyle p\land q} " uses the logical connective ∧ {\displaystyle \land } ( and ). It could be used to express
33998-602: The walls of the Nazi's Entartete Kunst exhibition in 1937. Despite high ticket prices, the exhibition lost money, with only one recorded sale. The Berlin group published periodicals such as Club Dada , Der Dada , Everyman His Own Football , and Dada Almanach . They also established a political party, the Central Council of Dada for the World Revolution . In Cologne , Ernst, Baargeld, and Arp launched
34189-433: The war, Hannah Höch and George Grosz used Dada to express communist sympathies. Grosz, together with John Heartfield , Höch and Hausmann developed the technique of photomontage during this period. Johannes Baader , the uninhibited Oberdada, was the "crowbar" of the Berlin movement's direct action according to Hans Richter and is credited with creating the first giant collages, according to Raoul Hausmann . After
34380-753: The war, the artists published a series of short-lived political magazines and held the First International Dada Fair , 'the greatest project yet conceived by the Berlin Dadaists', in the summer of 1920. As well as work by the main members of Berlin Dada – Grosz, Raoul Hausmann , Hannah Höch , Johannes Baader , Huelsenbeck and Heartfield – the exhibition also included the work of Otto Dix , Francis Picabia , Jean Arp, Max Ernst , Rudolf Schlichter , Johannes Baargeld and others. In all, over 200 works were exhibited, surrounded by incendiary slogans, some of which also ended up written on
34571-450: The whole prevailing order. Ball said that Janco's mask and costume designs, inspired by Romanian folk art, made "the horror of our time, the paralyzing background of events" visible. According to Ball, performances were accompanied by a "balalaika orchestra playing delightful folk-songs." Often influenced by African music , arrhythmic drumming and jazz were common at Dada gatherings. After the cabaret closed down, Dada activities moved on to
34762-409: The work of various artists. Dada subsequently combined these approaches. Many Dadaists believed that the 'reason' and 'logic' of bourgeois capitalist society had led people into war. They expressed their rejection of that ideology in artistic expression that appeared to reject logic and embrace chaos and irrationality . For example, George Grosz later recalled that his Dadaist art was intended as
34953-430: The world including New York, Zürich, Berlin, Paris and others. There were regional differences like an emphasis on literature in Zürich and political protest in Berlin. Prominent Dadaists published manifestos, but the movement was loosely organized and there was no central hierarchy. On 14 July 1916, Ball originated the seminal Dada Manifesto . Tzara wrote a second Dada manifesto, considered important Dada reading, which
35144-479: The world. Beyond the intellectual realms of political economy , history, and political science that discuss, describe, and analyze the bourgeoisie as a social class, the colloquial usage of the sociological terms bourgeois and bourgeoise describe the social stereotypes of the old money and of the nouveau riche , who is a politically timid conformist satisfied with a wealthy, consumerist style of life characterized by conspicuous consumption and
35335-538: Was a ballet that was clearly parodying itself, something traditional ballet patrons would obviously have serious issues with. Dada in Paris surged in 1920 when many of the originators converged there. Inspired by Tzara, Paris Dada soon issued manifestos, organized demonstrations, staged performances and produced a number of journals (the final two editions of Dada , Le Cannibale , and Littérature featured Dada in several editions.) The first introduction of Dada artwork to
35526-504: Was a refuge for writers and artists from the First World War. Soon after arriving from France in 1915, Marcel Duchamp and Francis Picabia met American artist Man Ray . By 1916 the three of them became the center of radical anti-art activities in the United States. American Beatrice Wood , who had been studying in France, soon joined them, along with Elsa von Freytag-Loringhoven . Arthur Cravan , fleeing conscription in France,
35717-488: Was also in New York for a time. Much of their activity centered in Alfred Stieglitz 's gallery, 291 , and the home of Walter and Louise Arensberg . The New Yorkers, though not particularly organized, called their activities Dada, but they did not issue manifestos. They issued challenges to art and culture through publications such as The Blind Man , Rongwrong , and New York Dada in which they criticized
35908-405: Was discussed at length around the turn of the 20th century but it is not widely accepted today. Premises and conclusions have an internal structure. As propositions or sentences, they can be either simple or complex. A complex proposition has other propositions as its constituents, which are linked to each other through propositional connectives like "and" or "if...then". Simple propositions, on
36099-411: Was impressed by the populist antisemitism and the anti-liberal bourgeois agitation of Karl Lueger , who as the mayor of Vienna during Hitler's time in the city, used a rabble-rousing style of oratory that appealed to the wider masses. When asked whether he supported the "bourgeois right-wing", Hitler claimed that Nazism was not exclusively for any class , and he also indicated that it favored neither
36290-647: Was no bourgeoisie apart from the citizenry of the cities. Rural peasants came under a different legal system. In communist philosophy , the bourgeoisie is the social class that came to own the means of production during modern industrialisation and whose societal concerns are the value of private property and the preservation of capital to ensure the perpetuation of their economic dominance in society. The Modern French word bourgeois ( / ˈ b ʊər ʒ w ɑː / BOORZH -wah or / b ʊər ˈ ʒ w ɑː / boorzh- WAH , French: [buʁʒwa] ) derived from
36481-409: Was published in 1918. Tzara's manifesto articulated the concept of "Dadaist disgust"—the contradiction implicit in avant-garde works between the criticism and affirmation of modernist reality. In the Dadaist perspective modern art and culture are considered a type of fetishization where the objects of consumption (including organized systems of thought like philosophy and morality) are chosen, much like
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