English

Bicompact torsion classes and conjectures on brick infinite algebras

Representation Theory 2026-04-07 v1

Abstract

A torsion class T\mathcal{T} of the module category modA\operatorname{\mathsf{mod}} A of a finite dimensional algebra AA over a field KK is said to be compact if there exists a module MmodAM \in \operatorname{\mathsf{mod}} A such that T\mathcal{T} is the smallest torsion class containing MM. If a torsion class satisfies this and the dual condition, then we call it a bicompact torsion class. We conjecture that bicompact torsion classes are precisely functorially finite torsion classes, and prove it for hereditary algebras and also for semistable torsion classes. This gives that Demonet Conjecture implies Enomoto Conjecture, both of which are important conjectures on brick infiniteness.

Keywords

Cite

@article{arxiv.2604.04505,
  title  = {Bicompact torsion classes and conjectures on brick infinite algebras},
  author = {Sota Asai},
  journal= {arXiv preprint arXiv:2604.04505},
  year   = {2026}
}

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11 pages