The ring of multisymmetric functions

Details The ring of multisymmetric functions The ring of multisymmetric functions

2004-05-26

arxiv.org/abs/math/0405490v2

Mathematics

Combinatorics

to be published on Annales de l'Institut Fourier vol.55 (2005)

Scientific paper

Let R be a commutative ring and let n,m be two positive integers. The symmetric group on n letters acts diagonally on the ring of polynomials in nxm variables with coefficients in R. The subrings of invariants for this action is called the ring of multisymmetric functions since these are the usual symmetric functions when m=1. In this paper we will give a presentation in terms of generators and relations that holds for any R and any n,m answering in this way to a classical question. I would like to thank M.Brion, C.De Concini and C.Procesi, in alphabetical order, for useful discussions.

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