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arXiv 1105.4121math.RA
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仿射PI-代数上的有理群作用

Rational group actions on affine PI-algebras

Martin Lorenz

摘要:

设R是代数闭域k上的仿射PI-代数,G是R上代数自同构有理作用的仿射代数k-群.对于R素且G是环面,证明了R只有2个G-素理想当且仅当G在R的中心上的作用是多重自由的.这推广了仿射代数G簇的一个标准结果。在R和G的适当假设下,我们还证明了一个著名的球形簇的结果和Schelter的catenarity定理的G-素数的一个版本的PI-版本。

英文摘要:

Let R be an affine PI-algebra over an algebraically closed field k and let G be an affine algebraic 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 center 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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