The second cohomology of small irreducible modules for simple algebraic groups
George J. McNinch
Abstract
Let G be a simple, simply connected and connected algebraic group over an algebraically closed field of characteristic p>0, and let V be a rational G-module such that dim V <= p. According to a result of Jantzen, V is completely reducible, and H1(G,V)=0. In this paper we show that H2(G,V) = 0 unless some composition factor of V is a non-trivial Frobenius twist of the adjoint representation of G.
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