Generalized quasiorders: constructions and characterizations

D. Jakubíková-Studenovská, R. Pöschel, S. Radeleczki

Quasiorders $\varrho \subseteq A^2$ have the property that an operation $f:A^n\to A$ preserves $\varrho$ if and only if each (unary) translation obtained from $f$ is an endomorp…