$τ$-cluster morphism categories of factor algebras

Abstract

We take a novel lattice-theoretic approach to the $\tau$-cluster morphism category $\mathfrak{T}(A)$ of a finite-dimensional algebra $A$ and define the category via the lattice of torsion classes $\mathrm{tors } A$. Using the lattice congruence induced by an ideal $I$ of $A$ we establish a functor $F_I: \mathfrak{T}(A) \to \mathfrak{T}(A/I)$ and if $\mathrm{tors } A$ is finite an inclusion $\mathcal{I}: \mathfrak{T}(A/I) \to \mathfrak{T}(A)$. We characterise when these functors are full, faithful and adjoint. As a consequence we find a new family of algebras for which $\mathfrak{T}(A)$ admits a faithful group functor.