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The Noether Bound in Invariant Theory of Finite Groups
- Source :
- Advances in Mathematics. (1):23-32
- Publisher :
- Academic Press.
-
Abstract
- Let R be a commutative ring, V a finitely generated free R-module and G⩽GLR(V) a finite group acting naturally on the graded symmetric algebra A=Sym(V). Let β(AG) denote the minimal number m, such that the ring AG of invariants can be generated by finitely many elements of degree at most m. Furthermore, let H◁G be a normal subgroup such that the index |G : H| is invertible in R. In this paper we prove the inequality β(A G )⩽β(A H )·|G : H|. For H=1 and |G| invertible in R we obtain Noether's bound β(AG)⩽|G|, which so far had been shown for arbitrary groups only under the assumption that the factorial of the group order, |G|!, is invertible in R.
Details
- Language :
- English
- ISSN :
- 00018708
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Advances in Mathematics
- Accession number :
- edsair.doi.dedup.....5eed4339fb2345aeeeabf04df36bb30c
- Full Text :
- https://doi.org/10.1006/aima.2000.1952