Arkady Onishchik


Arkady L'vovich Onishchik was a prominent Soviet and Russian mathematician, who worked on Lie groups and their geometrical applications.
Onishchik was a student of Eugene Dynkin, under whose guidance he got his PhD at Moscow State University in 1960. In 1962 Onishchik received the Prize of the Moscow Mathematical Society for young mathematicians. In 1970 he got Habilitation. Since 1975 Onishchik was a professor of Yaroslavl State University.
Onishchik introduced new homotopy invariants of homogeneous spaces and classified factorizations of connected simple compact Lie groups into the product of two connected Lie subgroups. In complex analysis, the Matsushima–Onishchik theorem describes homogeneous spaces of complex reductive groups that are Stein manifolds. In addition to Lie groups and algebras, Onishchik also worked on nonabelian cohomology and on supermanifolds.

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