A reductive group with finitely generated cohomology algebras

Details A reductive group with finitely generated cohomology algebras A reductive group with finitely generated cohomology algebras

2004-03-22

arxiv.org/abs/math/0403361v4

Algebraic Groups and Homogeneous spaces, Editor: V.B. Mehta, Narosa 2007, New Delhi, 301-314

Mathematics

Representation Theory

16 pages; minor changes; final version

Scientific paper

Let $G$ be the linear algebraic group $SL_3$ over a field $k$ of characteristic two. Let $A$ be a finitely generated commutative $k$-algebra on which $G$ acts rationally by $k$-algebra automorphisms. We show that the full cohomology ring $H^*(G,A)$ is finitely generated. This extends the finite generation property of the ring of invariants $A^G$. We discuss where the problem stands for other geometrically reductive group schemes.

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