For algebras R⊗kQ with R local and Q acyclic, BHM mutation of complete τ-exceptional sequences coincides with classical mutation, and the braid group acts transitively.
$\tau$-exceptional sequences for representations of quivers over local algebras
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abstract
Let $k$ be an algebraically closed field. Let $R$ be a finite dimensional commutative local $k$-algebra and let $Q$ be a quiver with no oriented cycles. In this paper, we study (signed) $\tau$-exceptional sequences over the algebra $\Lambda = R\otimes kQ$, which is isomorphic to $RQ$. We show there is a bijection between the set of complete (signed) $\tau$-exceptional sequences in $\text{mod }kQ$ and the set of complete (signed) $\tau$-exceptional sequences in $\text{mod }\Lambda$. Moreover, we prove that every $\tau$-perpendicular subcategory of $\text{mod }\Lambda$ is equivalent to the module category of $R\otimes kQ'$, for some quiver $Q'$. As a consequence, we prove that the $\tau$-cluster morphism categories of $kQ$ and $\Lambda$ are equivalent.
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Mutation of $\tau$-exceptional sequences for acyclic quivers over local algebras
For algebras R⊗kQ with R local and Q acyclic, BHM mutation of complete τ-exceptional sequences coincides with classical mutation, and the braid group acts transitively.