Faithful linear representations of bands.
Finite Abelian semigroups represented into the power set of finite groups
Finite communative semigroups having Frobenius semigroup algebras.
Finite commutative monoids of open maps
Finite monoids having isotypical regular representations.
Finitely generated weakly reductive commutative semigroups.
Finite-to-finite universal varieties of distributive double -algebras
Fundamental order relations on inverse semigroups and on their generalizations.