The core congruence on a monoid.
The injective hull of S-sets, S a semilattice of groups.
The multiplicative behavior of H.
The primitivity of semigroup algebras of free products.
The pseudovariety of semigroups of triangular matrices over a finite field
We show that semigroups representable by triangular matrices over a fixed finite field form a decidable pseudovariety and provide a finite pseudoidentity basis for it.
The pseudovariety of semigroups of triangular matrices over a finite field
We show that semigroups representable by triangular matrices over a fixed finite field form a decidable pseudovariety and provide a finite pseudoidentity basis for it.
The semigroup of finite complexes of a group
Two results on real continuous bicharacters.