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arxiv: 1705.00068 · v2 · pith:N6IEZYEHnew · submitted 2017-04-28 · 🧮 math.RA

Auslander's Theorem for permutation actions on noncommutative algebras

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

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