Symmetric products, linear representations and the commuting scheme

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We show that the ring of multisymmetric functions over a commutative ring is isomorphic to the ring generated by the coefficients of the characteristic polynomial of polynomials in commuting generic matrices. As a consequence we give a surjection from the ring of invariants of several matrices to the ring of multisymmetric functions generalizing a classical result of H.Weyl and F.Junker. We also find a surjection from the ring of invariants over the commuting scheme to the ring of multisymmetric functions. This surjection is an isomophism over a characteristic zero field and induces an isomorphism at the level of reduced structures over an infinite field of positive characteristic.
Accepted for publication on "Journal of Algebra", Elsevier. 9 pages

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Algebraic Geometry, Commutative Algebra, Representation Theory, 14L30;13A50;14A15

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http://salesiana.dossiersoluciones.com/handle/123456789/130986

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0602660
 http://arxiv.org/abs/math/0602660

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arXiv