Mathematics – Representation Theory
Scientific paper
2007-06-05
Transformation Groups, Vol. 14, No. 3, 2009, pp. 695-711
Mathematics
Representation Theory
22 pages; final version
Scientific paper
10.1007/S00031-009-9054-0
Let G be GL_N or SL_N as reductive linear algebraic group over a field k of positive characteristic p. We prove several results that were previously established only when N < 6 or p > 2^N. Let G act rationally on a finitely generated commutative k-algebra A. Assume that A as a G-module has a good filtration or a Schur filtration. Let M be a noetherian A-module with compatible G action. Then M has finite good/Schur filtration dimension, so that there are at most finitely many nonzero H^i(G,M). Moreover these H^i(G,M) are noetherian modules over the ring of invariants A^G. Our main tool is a resolution involving Schur functors of the ideal of the diagonal in a product of Grassmannians.
der Kallen Wilberd van
Srinivas Vasudevan
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