On the finiteness of the derived equivalence classes of some stable endomorphism rings

August, J. (2020) On the finiteness of the derived equivalence classes of some stable endomorphism rings. Mathematische Zeitschrift, 296(3-4), pp. 1157-1183. (doi: 10.1007/s00209-020-02475-y)

Abstract

We prove that the stable endomorphism rings of rigid objects in a suitable Frobenius category have only finitely many basic algebras in their derived equivalence class and that these are precisely the stable endomorphism rings of objects obtained by iterated mutation. The main application is to the Homological Minimal Model Programme. For a 3-fold flopping contraction $f :X \to Spec R$, where $X$ has only Gorenstein terminal singularities, there is an associated finite dimensional algebra $A_{{\text {con}}}$ known as the contraction algebra. As a corollary of our main result, there are only finitely many basic algebras in the derived equivalence class of $A_{\text {con}}$ and these are precisely the contraction algebras of maps obtained by a sequence of iterated flops from $f$. This provides evidence towards a key conjecture in the area.

• Item Type: Articles
• Additional Information: Open access funding provided by Projekt DEAL.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: August, Dr Jenny
• Authors: August, J.
• College/School: University Services > Learning and Teaching Services Division
• Journal Name: Mathematische Zeitschrift
• Publisher: Springer
• ISSN: 0025-5874
• ISSN (Online): 1432-1823
• Published Online: 06 February 2020
• Copyright Holders: Copyright © 2020 The Author
• First Published: First published in Mathematische Zeitschrift 296(3-4):1157-1183
• Publisher Policy: Reproduced under a Creative Commons License