Tue, 19 Sep 2023, 1:25 pm MDT

A variety $\mathcal V$ is a Schreier variety if every if every subalgebra of a $\mathcal V$-free algebra is free. I will explain a link between the concept of a Schreier variety and tame congruence theory. Namely, I will explain why a locally finite variety is a Schreier variety if and only if it consists of minimal algebras.