András Hajnal

András Hajnal (May 13, 1931 – July 30, 2016) was a professor of mathematics at Rutgers University and a member of the Hungarian Academy of Sciences known for his work in set theory and combinatorics.

Hajnal was born on 13 May 1931, in Budapest, Hungary.

He received his university diploma (M.Sc. degree) in 1953 from the Eötvös Loránd University, his Candidate of Mathematical Science degree (roughly equivalent to Ph.D.) in 1957, under the supervision of László Kalmár, and his Doctor of Mathematical Science degree in 1962. From 1956 to 1995 he was a faculty member at the Eötvös Loránd University; in 1994, he moved to Rutgers University to become the director of DIMACS, and he remained there as a professor until his retirement in 2004. He became a member of the Hungarian Academy of Sciences in 1982, and directed its mathematical institute from 1982 to 1992. He was general secretary of the János Bolyai Mathematical Society from 1980 to 1990, and president of the society from 1990 to 1994. Since 1981, he has been an advisory editor of the journal Combinatorica. Hajnal was also one of the Honorary Presidents of the European Set Theory Society.

Hajnal was an avid chess player.

Hajnal was the father of Peter Hajnal, the co-dean of the European College of Liberal Arts.

Hajnal was the author of over 150 publications. Among the many co-authors of Paul Erdős, he had the second largest number of joint papers, 56. With Peter Hamburger, he wrote a textbook, Set Theory (Cambridge University Press, 1999, ). Some of his more well-cited research papers include

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