Two Congruence Lattices of Completely Simple Semigroups.
Two constructions of compatible relations
Two element direct limit classes of monounary algebras
Two types of retract irreducibility of connected monounary algebras
Let be a connected monounary algebra. The paper deals with retract irreducibility of in the class of all connected monounary algebras and in the class of all monounary algebras.
Two-generated idempotent groupoids with small clones
A characterization of all classes of idempotent groupoids having no more than two essentially binary term operations with respect to small finite models is given.