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arXiv · 2402.13527

Dimensions of $τ$-tilting modules over path algebras and preprojective algebras of Dynkin type

Toshitaka Aoki·Yuya Mizuno
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Abstract

In this paper, we introduce a new generating function called $d$-polynomial for the dimensions of $τ$-tilting modules over a given finite dimensional algebra. Firstly, we study basic properties of $d$-polynomials and show that it can be realized as a certain sum of the $f$-polynomials of the simplicial complexes arising from $τ$-rigid pairs. Secondly, we give explicit formulas of $d$-polynomials for preprojective algebras and path algebras of Dynkin quivers by using a close relation with $W$-Eulerian polynomials and $W$-Narayana polynomials. Thirdly, we consider the ordinary and exponential generating functions defined from $d$-polynomials and give closed-form expressions in the case of preprojective algebras and path algebras of Dynkin type $\mathbb{A}$.

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Toshitaka Aoki, Yuya Mizuno. 2025-03-07. Dimensions of $τ$-tilting modules over path algebras and preprojective algebras of Dynkin type. https://arxiv.org/abs/2402.13527

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