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RATIONAL GROUP ACTIONS ON AFFINE PI-ALGEBRAS

Published online by Cambridge University Press:  01 October 2013

MARTIN LORENZ
MARTIN LORENZ*
Affiliation:
Department of Mathematics, Temple University, Philadelphia, PA 19122, USA e-mail: lorenz@temple.edu
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Abstract

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Let R be an affine PI-algebra over an algebraically closed field $\mathbb{k}$ and let G be an affine algebraic $\mathbb{k}$-group that acts rationally by algebra automorphisms on R. For R prime and G a torus, we show that R has only finitely many G-prime ideals if and only if the action of G on the centre of R is multiplicity free. This extends a standard result on affine algebraic G-varieties. Under suitable hypotheses on R and G, we also prove a PI-version of a well-known result on spherical varieties and a version of Schelter's catenarity theorem for G-primes.

Keywords

16R3016W22

References

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