Minimal ($\tau$-)tilting infinite algebras

TL;DR

This paper introduces minimal $ au$-tilting infinite algebras, exploring their properties, relation to classical tilting theory, and implications for longstanding conjectures in representation theory.

Contribution

It systematically studies minimal $ au$-tilting infinite algebras, connecting modern $ au$-tilting theory with classical concepts and providing new proofs for existing conjectures.

Findings

Minimal $ au$-tilting infinite algebras are characterized and related to classical tilting theory.

Proved that minimal extending bricks have open orbits.

Provided a simple proof of the brick analogue of the First Brauer-Thrall Conjecture.

Abstract

Motivated by a new conjecture on the behavior of bricks, we start a systematic study of minimal $\tau$-tilting infinite algebras. In particular, we treat minimal $\tau$-tilting infinite algebras as a modern counterpart of minimal representation infinite algebras and show some of the fundamental similarities and differences between these families. We then relate our studies to the classical tilting theory and observe that this modern approach can provide fresh impetus to the study of some old problems. We further show that in order to verify the conjecture it is sufficient to treat those minimal $\tau$-tilting infinite algebras where almost all bricks are faithful. Finally, we also prove that minimal extending bricks have open orbits, and consequently obtain a simple proof of the brick analogue of the First Brauer-Thrall Conjecture, recently shown by Schroll and Treffinger using some different techniques.