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Tilting-completion for gentle algebras

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arxiv 2412.13971 v3 pith:3G6P2C5J submitted 2024-12-18 math.RT

classification math.RT
keywords gentlemodulealgebraalgebraspartial-tiltingranksurfaceadditionally
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abstract

It is demonstrated that any almost-tilting module over a gentle algebra is indeed partial-tilting, meaning it can be completed as a tilting module. Furthermore, such a module has at most $2n$ possible complements, thereby confirming a (modified) conjecture of Happel for the case of gentle algebras. Additionally, for any $n\geq 3$ and $1\leq m \leq n-2$, there always exists a (connected) gentle algebra with rank $n$ and a pre-tilting module of rank $m$ which is not partial-tilting. The tool we use is the surface model associated with the module category of a gentle algebra. The main technique is an induction process involving surface cuts, which is hoped to be beneficial for other applications as well.

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  1. Geometric models for endomorphism algebras of tilting modules over gentle algebras

    math.RT 2026-07 conditional novelty 6.0 of 10

    For gentle algebras from surface tilings, the endomorphism algebra of a tilting module attached to a faithful dissection is isomorphic to an explicitly defined quiver algebra, and a new tiling realizes that endomorphi...

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