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arXiv · 1505.00934

Existence of Gradings on Associative Algebras

Dusko Bogdanic
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Abstract

In this paper we study the existence of gradings on finite dimensional associative algebras. We prove that a connected algebra $A$ does not have a non-trivial grading if and only if $A$ is basic, its quiver has one vertex, and its group of outer automorphisms is unipotent. We apply this result to prove that up to graded Morita equivalence there do not exist non-trivial gradings on the blocks of group algebras with quaternion defect groups and one isomorphism class of simple modules.

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Dusko Bogdanic. 2015-05-05. Existence of Gradings on Associative Algebras. https://arxiv.org/abs/1505.00934

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