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Which cluster morphism categories are CAT(0)

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arxiv 2203.16679 v1 pith:HAMEFI4N submitted 2022-03-30 math.RT

classification math.RT
keywords categoryclustermorphismspacefinitehereditarypicturetype
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abstract

The cluster morphism category of an hereditary algebra was introduced in [5] to show that the picture space of an hereditary algebra of finite representation type is a $K(\pi,1)$ for the associated picture group, thereby allowing for the computation of the homology of picture groups of finite type as carried out in [7] for the case of $A_n$. In this paper we show that the cluster morphism category is a $CAT(0)$-category for hereditary algebras of finite or tame type with only small tubes. As a consequence, we get that the classifying space of the cluster morphism category is a locally $CAT(0)$ space and, as a consequence of that, we get that this classifying space is a $K(\pi,1)$.

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Cited by 1 Pith paper

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  1. Mutating ordered $\tau$-rigid modules with applications to Nakayama algebras

    math.RT 2025-01 conditional novelty 7.0 of 10

    Over Nakayama algebras, the mutation operation on τ-exceptional sequences is transitive, with explicit combinatorial formulas for each mutation step.

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