English

Auslander's Theorem for permutation actions on noncommutative algebras

Rings and Algebras 2020-12-09 v2

Abstract

When A=k[x1,,xn]A = \mathbb{k}[x_1, \ldots, x_n] and GG is a small subgroup of GLn(k)\operatorname{GL}_n(\mathbb{k}), Auslander's Theorem says that the skew group algebra A#GA \# G is isomorphic to EndAG(A)\operatorname{End}_{A^G}(A) as graded algebras. We prove a generalization of Auslander's Theorem for permutation actions on (1)(-1)-skew polynomial rings, (1)(-1)-quantum Weyl algebras, three-dimensional Sklyanin algebras, and a certain graded down-up algebra. We also show that certain fixed rings AGA^G are graded isolated singularities in the sense of Ueyama.

Keywords

Cite

@article{arxiv.1705.00068,
  title  = {Auslander's Theorem for permutation actions on noncommutative algebras},
  author = {Jason Gaddis and Ellen Kirkman and W. Frank Moore and Robert Won},
  journal= {arXiv preprint arXiv:1705.00068},
  year   = {2020}
}
R2 v1 2026-06-22T19:31:31.044Z