Alfréd Rényi (20 March 1921 – 1 February 1970) was a Hungarian mathematician known for his work in probability theory , though he also made contributions in combinatorics , graph theory , and number theory .
21-929: (Redirected from Rényi ) Renyi or Rényi may refer to: People [ edit ] Alfréd Rényi (1921–1970), Hungarian mathematician Katalin Rényi (1951–2023), Hungarian painter and graphic designer Tibor Rényi (1973–), Hungarian painter Tom Renyi (1947–), American banker and businessman Locations in China [ edit ] Renyi, Rongchang County (仁义镇), town in Rongchang County , Chongqing Renyi, Hezhou (仁义镇), town in Babu District, Hezhou, Guangxi Renyi, Guiyang County (仁义镇), town in Guiyang County , Hunan Renyi, Leiyang (仁义镇),
42-703: A mathematician, in 1946; their daughter Zsuzsanna was born in 1948. After a brief assistant professorship at Budapest, he was appointed Professor Extraordinary at the University of Debrecen in 1949. In 1950, he founded the Mathematics Research Institute of the Hungarian Academy of Sciences , now bearing his name, and directed it until his early death. He also headed the Department of Probability and Mathematical Statistics of
63-407: A spectrum of useful diversity indices , and lead to a spectrum of fractal dimensions . The Rényi–Ulam game is a guessing game where some of the answers may be wrong. In probability theory, he is also known for his parking constants , which characterize the solution to the following problem: given a street of some length and cars of unit length parking on a random free position on the street, what
84-524: A strengthening of this result, shows that the theorem is true for K = 2, for all sufficiently large even numbers. The case K = 1 is the still-unproven Goldbach conjecture . In information theory , he introduced the spectrum of Rényi entropies of order α , giving an important generalisation of the Shannon entropy and the Kullback–Leibler divergence . The Rényi entropies give
105-466: A town of Leiyang City , Hunan . Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Renyi . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Renyi&oldid=1173675886 " Category : Disambiguation pages Hidden categories: Short description
126-724: A well established programme in the English language for international students, particularly in the Medical and Engineering field, which first established education in English in 1886. There are nearly 6000 international students studying at the university. Until 2014 technical Academy Awards (Oscars) have been awarded to five former students. The university also operates an associated Basic Medicine campus in Geochang County , South Korea. Higher education began in Debrecen with
147-699: A year in hiding, he managed to get hold of a soldier's uniform and march his parents out of the Budapest Ghetto , where they were captive. That mission required enormous courage and planning skills. Rényi then completed his PhD in 1947 at the University of Szeged , under the advisement of Frigyes Riesz . He did his postgraduate in Moscow and Leningrad , where he collaborated with a prominent Soviet mathematician Yuri Linnik . Rényi married Katalin Schulhof (who used Kató Rényi as her married name), herself
168-473: Is different from Wikidata All article disambiguation pages All disambiguation pages Alfr%C3%A9d R%C3%A9nyi Rényi was born in Budapest to Artúr Rényi and Borbála Alexander; his father was a mechanical engineer, while his mother was the daughter of philosopher and literary critic Bernhard Alexander ; his uncle was Franz Alexander , a Hungarian-American psychoanalyst and physician. He
189-470: Is more likely that the original formulation was in Hungarian. He is also famous for having said, "If I feel unhappy, I do mathematics to become happy. If I am happy, I do mathematics to keep happy." The Alfréd Rényi Prize , awarded by the Hungarian Academy of Science , was established in his honor. In 1950 Rényi founded the Mathematics Research Institute of the Hungarian Academy of Sciences . It
210-470: Is technically independent of the university. The School teaches Hungarian culture and Hungarian as a foreign language to foreigners, year-round. The most popular journal of the university is Egyetemi Élet ('University Life') and the leading online media of students is www.egyetemportal.hu . The university also publishes the Hungarian Journal of English and American Studies In January 2023,
231-522: Is the mean density of cars when there are no more free positions? The solution to that problem is asymptotically equal to 0.7475979 (sequence A050996 in the OEIS ). Thus, random parking is 25.2% less efficient than optimal packing. He wrote 32 joint papers with Paul Erdős , the most well-known of which are his papers introducing the Erdős–Rényi model of random graphs . The corpus of his bibliography
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#1732780453397252-531: The Eötvös Loránd University , from 1952. He was elected a corresponding member (1949), then full member (1956), of the Hungarian Academy of Sciences . Rényi proved, using the large sieve , that there is a number K {\displaystyle K} such that every even number is the sum of a prime number and a number that can be written as the product of at most K {\displaystyle K} primes. Chen's theorem ,
273-602: The Calvinist College of Debrecen, which was founded in 1538. Over centuries of its existence it was one of the key institutions of higher education in Hungary. In the beginning of the 20th century the college was transformed into a university, and has a strong link and cooperation with the present Calvinist College's Debrecen Reformed Theological University . In 1908, the Calvinist Academy of Humanities
294-603: The University of Agriculture, Lajos Kossuth University, and the Medical University, were combined. The resulting University of Debrecen had five universities and three college-level faculties, and 20,000 students. The Conservatory of Debrecen and schools of the university in Hajdúböszörmény and Nyíregyháza joined later. The Debrecen Summer School , founded in 1927, is also located on campus, although it
315-517: The day. The Faculty of Theology was returned to the Calvinist College, the Faculty of Medicine became an independent university (until 2000), the Faculty of Law was discontinued, and members of the teaching staff were expelled from the university. The departments of English, French, Italian, German, and Classical Philology were closed down, while the Department of Russian expanded dramatically. The teaching of western languages resumed only after 1956, with
336-418: The exception of Italian which was not offered again until the 1990s. The Faculty of Natural Sciences became an independent faculty in 1949, and moved into the new Chemistry Building in 1970. In 1952 the Faculty of Arts and the Faculty of Natural Sciences changed their name to Lajos Kossuth University, which they retained until 2000. On January 1, 2000, the colleges and universities of Hajdú-Bihar county,
357-465: The university's main building was completed. It is the largest building in the city, and was designed in eclectic and neo-baroque style. In 1949/1950, the university was restructured under communist control. The primary goal of the "reorganization" was to split the university into smaller, less integrated institutions, and also to weaken or even dissolve units which did not fit to the Soviet agenda of
378-468: Was compiled by the mathematician Pál Medgyessy . Rényi, who was addicted to coffee, is the source of the quote: "A mathematician is a device for turning coffee into theorems", which is often ascribed to Erdős. It has been suggested that this sentence was originally formulated in German, where it can be interpreted as a double entendre on the meaning of the word Satz (theorem or coffee residue), but it
399-544: Was created, and in 1912, the Hungarian Royal University was founded. The university incorporated the theology, law, and arts faculties of the college and added a medical school. Teaching began in 1914 in the old Calvinist College buildings. In 1918, the first new medical school building was opened, and the original medical school campus was completed in 1927. In 1921, the university took the name of István Tisza , former prime minister of Hungary. In 1932
420-426: Was prevented from enrolling in university in 1939 due to the anti-Jewish laws then in force, but enrolled at the University of Budapest in 1940 and finished his studies in 1944. At this point, he was drafted to forced labour service , from which he managed to escape during transportation of his company. He was in hiding with false documents for six months. Biographers tell an incredible story about Rényi: after half of
441-681: Was renamed the Alfréd Rényi Institute of Mathematics in July 1999. Foundations of Probability and Probability Theory have both been reprinted by Dover Publications . University of Debrecen The University of Debrecen ( Hungarian : Debreceni Egyetem [ˈdɛbrɛt͡sɛni ˈɛɟɛtɛm] ) is a university located in Debrecen , Hungary. It is the oldest continuously operating institution of higher education in Hungary ever since its establishment in 1538. The university has
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