In this expository note, I present some of the key features of the lattice of torsion classes of a finite-dimensional algebra, focussing in particular on its complete semidistributivity and consequences thereof. This is intended to serve as an introduction to recent work by Barnard–Carroll–Zhu and Demonet–Iyama–Reading–Reiten–Thomas.

中文翻译：

---

扭转类的格简介

在此说明性注释中，我介绍了有限维代数的扭转类格的一些关键特征，尤其着重于其完整的半分布性及其后果。本文旨在作为对Barnard–Carroll–Zhu和Demonet–Iyama–Reading–Reiten–Thomas最近工作的介绍。