Semigroups containing ubiquitous elements.
Semigroups for which all homomorphic images have complemented lattices of congruences.
Semigroups for which every S-system has the natural partial order.
Semigroups for which every totally irreducible -system is injective
Semigroups in which a power of each element lies in a subgroup.
Semigroups in which prime ideals are maximal.
Semigroups in Which some Ideal is a Completely Simple Semigroup
Semigroups of cosets of semigroups: variations on a Dubreil theme.
Semigroups of order 8.
Semigroups of rank 1 (in Russian).
Semigroups of right quotients of a semigroup which is a semilattice of groups.
Semigroups satisfying permutation identities.
Semigroups satisfying variable identities.
Semigroups satisfying (xy)m = xmym .
Semigroups whose proper left ideals are commutative
Semigroups whose proper one-sided ideals are t - archimedean
Semigroups whose proper subsemigroups are duo
Semigroups whose proper subsemigroups are quasicommutative.
Semigroups whose proper two-sided ideals are power joined.
Semigroups with a noncommutative arithmetic.