On Chevalley-Shephard-Todd's theorem in positive characteristic

Details On Chevalley-Shephard-Todd's theorem in positive characteristic On Chevalley-Shephard-Todd's theorem in positive characteristic

2007-09-05

arxiv.org/abs/0709.0715v1

Mathematics

Commutative Algebra

14 pages

Scientific paper

Let $G$ be a finite group acting linearly on the vector space $V$ over a field of arbitrary characteristic. The action is called coregular if the invariant ring is generated by algebraically independent homogeneous invariants and the direct summand property holds if there is a surjective $k[V]^G$-linear map $\pi:k[V]\to k[V]^G$. The following Chevalley-Shephard-Todd type theorem is proved. Suppose $V$ is an irreducible $kG$-representation, then the action is coregular if and only if $G$ is generated by pseudo-reflections and the direct summand property holds.

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