Logic List Mailing Archive

Andras Hajnal (1931-2016)

We are sad to report that Andrs Hajnal, one of the Honorary Presidents of 
the European Set Theory Society, very unexpectedly died on 30 July 2016 
after having a heart attack.

He started his work in axiomatic set theory, in fact he was the first to 
introduce and study relative constructibility, extending the work of 
Gdel. However, he is more widely known for his ground breaking work in 
combinatorial set theory, as one of the founders, in collaboration with 
Erdos and Rado, of the theory of set mappings and, most of all, the 
partition calculus. His celebrated joint result with Galvin on cardinal 
exponentiation initiated Shelah to create PCF theory. He also published 
more than 30 papers on set theoretic topology and so played an essential 
role in the introduction of the tools and methods of modern set theory to 
problems of general topology.

In addition to his work in set theory, he has made significant 
contributions to finite combinatorics as well. Perhaps the best known of 
these is the Hajnal-Szemerdi theorem on equitable coloring of graphs that 
proved a conjecture of Erdos.

European Set Theory Society (ESTS)
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