English

Classifying $\tau$-tilting modules over the Auslander algebra of $K[x]/(x^n)$

Representation Theory 2020-08-05 v2 Rings and Algebras

Abstract

We build a bijection between the set \sttiltΛ\sttilt\Lambda of isomorphism classes of basic support τ\tau-tilting modules over the Auslander algebra Λ\Lambda of K[x]/(xn)K[x]/(x^n) and the symmetric group Sn+1\mathfrak{S}_{n+1}, which is an anti-isomorphism of partially ordered sets with respect to the generation order on \sttiltΛ\sttilt\Lambda and the left order on Sn+1\mathfrak{S}_{n+1}. This restricts to the bijection between the set \tiltΛ\tilt\Lambda of isomorphism classes of basic tilting Λ\Lambda-modules and the symmetric group Sn\mathfrak{S}_n due to Br\"{u}stle, Hille, Ringel and R\"{o}hrle. Regarding the preprojective algebra Γ\Gamma of Dynkin type AnA_n as a factor algebra of Λ\Lambda, we show that the tensor functor ΛΓ-\otimes_{\Lambda}\Gamma induces a bijection between \sttiltΛ\sttiltΓ\sttilt\Lambda\to\sttilt\Gamma. This recover Mizuno's bijection Sn+1\sttiltΓ\mathfrak{S}_{n+1}\to\sttilt\Gamma for type AnA_n.

Keywords

Cite

@article{arxiv.1602.05037,
  title  = {Classifying $\tau$-tilting modules over the Auslander algebra of $K[x]/(x^n)$},
  author = {Osamu Iyama and Xiaojin Zhang},
  journal= {arXiv preprint arXiv:1602.05037},
  year   = {2020}
}