Semigroups which admit few embeddings
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 subsemigroups are -regular
Semigroups whose proper two-sided ideals are power joined.
Semigroups whose regular ... -classes form well-ordered chains.
Semigroups whose regular J-classes form finite lattices.
Semigroups with a noncommutative arithmetic.
Semigroups with A-semidistributive subsemigroup lattices.
Semigroups with bisimple and simple w-subsemigroups.
Semigroups with Boolean Congruence Lattices.
Semigroups with each element disjunctive.
Semigroups with exactly three regular ...-classes.
Semigroups with idempotent powers, I.
Semigroups with idempotent powers, II: The lattices of equational subclasses of [(xy2 =xy] .
SEMIGROUPS WITH MAXIMAL CONDITIONS.
Semigroups with midunits.
Semigroups with n-closed subsets.