Finiteness conjecture for semibricks and brick-finite algebras

Let Λ\Lambda be a finite-dimensional algebra. A semibrick in modΛ\operatorname{mod}\Lambda is a set of bricks that are pairwise Hom-orthogonal. An algebra is brick-finite when it has only finitely many isomorphism classes of bricks; equivalently, Λ\Lambda is τ\tau-tilting finite.

Semibrick finiteness conjecture. If every semibrick in modΛ\operatorname{mod}\Lambda is a finite set, then modΛ\operatorname{mod}\Lambda is brick-finite, that is, Λ\Lambda is τ\tau-tilting finite.

The preceding results establish several equivalent finiteness conditions for a general abelian category and show implications involving semibricks and brick-finiteness, but this converse is proposed as an open conjecture for finite-dimensional algebras.

Sources & referencesView supporting material

Primary source

Haruhisa Enomoto, “Monobrick, a uniform approach to torsion-free classes and wide subcategories”, arXiv:2005.01626 (2021).

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