Jacques Tits
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Jacques Tits (born August 12, 1930) is a Belgian mathematician. He has written and cowritten a large number of papers on a number of subjects, principally algebra.
He introduced the theory of buildings, which are combinatorial structures on which groups act, in many cases of interest in algebraic group theory (including finite groups, and groups defined over the p-adic numbers). The related theory of (B,N) pairs is a basic tool in the theory of groups of Lie type.
Tits received the Cantor Medal from the Deutsche Mathematiker-Vereinigung (German Mathematical Society) in 1996.