$\tau$-Tilting Finiteness of Non-distributive Algebras and their Module Varieties

TL;DR

This paper classifies the $ au$-tilting finiteness of certain minimal representation-infinite non-distributive algebras, establishing explicit conditions and exploring their connections to geometric module variety properties.

Contribution

It fully determines $ au$-tilting finiteness for non-distributive min-rep-infinite algebras and links $ au$-tilting theory with geometric module variety concepts.

Findings

Identifies which non-distributive min-rep-infinite algebras are $ au$-tilting finite.

Provides explicit conditions for $ au$-tilting infiniteness in this algebra family.

Shows the equivalence of Schur-representation-finiteness and $ au$-tilting finiteness for these algebras.

Abstract

We treat the $\tau$-tilting finiteness of those minimal representation-infinite (min-rep-infinite) algebras which are non-distributive. Building upon the new results of Bongartz, we fully determine which algebras in this family are $\tau$-tilting finite and which ones are not. This complements our previous work in which we carried out a similar analysis for the min-rep-infinite biserial algebras. Consequently, we obtain nontrivial explicit sufficient conditions for $\tau$-tilting infiniteness of a large family of algebras. This also produces concrete families of "minimal $\tau$-tilting infinite algebras"-- the modern counterpart of min-rep-infinite algebras, independently introduced by the author and Wang. We further use our results on the family of non-distributive algebras to establish a conjectural connection between the $\tau$-tilting theory and two geometric notions in the study of module varieties introduced by Chindris, Kinser and Weyman. We verify the conjectures for the algebras studied in this note: For the min-rep-infinite algebras which are non-distributive or biserial, we show that if $\Lambda$ has the dense orbit property, then it must be $\tau$-tilting finite. Moreover, we prove that such an algebra is Schur-representation-finite if and only if it is $\tau$-tilting finite. The latter result gives a categorical interpretation of Schur-representation-finiteness over this family of min-rep-infinite algebras.