Shifts of the Stable Kneser Graphs and Hom-Idempotence

Pablo Torres, Mario Valencia-Pabon

A graph $G$ is said to be {\em hom-idempotent} if there is a homomorphism from $G^2$ to $G$, and {\em weakly hom-idempotent} if for some $n\ge 1$ there is a homomorphism from $G^…