On the first cohomology of an algebraic group and its Lie algebra in positive characteristic

2014

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DOI 10.1134/s0001434614090247
Data confidence 70 medium
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Abstract

Necessary and sufficient conditions for the first cohomology group of an algebraic group with irreducible root system over an algebraically closed field of characteristic p > 0 to be isomorphic to the corresponding first cohomology group of the Lie algebra of the group with coefficients in simple modules are obtained. The spaces of outer derivations of the classical modular Lie algebras are evaluated for p > 2.