On support $\tau$-tilting graphs of gentle algebras

Abstract

Let $A$ be a finite-dimensional gentle algebra over an algebraically closed field. We investigate the combinatorial properties of support $\tau$-tilting graph of $A$. In particular, it is proved that the support $\tau$-tilting graph of $A$ is connected and has the so-called reachable-in-face property. This property was conjectured by Fomin and Zelevinsky for exchange graphs of cluster algebras which was recently confirmed by Cao and Li.

21 pages. v2: reference added, comments are welcome. v3: fix some typos, reference added, Remark 3.5 is added to discuss the converse of Prop. 3.4. v4:minor change

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