A Relation for Closure Operations on a Semigroup
A remark concerning congruences on [0,-] bisimple inverse semigroups.
A remark concerning -systems
A remark on a paper of H. Höft
A remark on intra-regular semigroups.
A remark on inverse Clifford semigroups
A remark on polynomial functions over finite monoids.
A remark on regular right duo semigroups
A remark on semigroups that are semilattices of right groups
A remark on the representation of trace monoids.
A representation of a semigroup by a semigroup of matrices over a group with zero.
A representation theorem for I-medial and for generalized inverse semigroups.
A sandwich theorem for monotone additive functions.
A semigroup approach to wreath-product extensions of Solomon's descent algebras.
A semigroup characterization of dot-depth one languages
A semigroup in function algebra.
A semigroup treatment of some theorems on non-negative matrices
A semigroup-theoretic proof of the law of large numbers.
A semilattice of varieties of completely regular semigroups
Completely regular semigroups are unions of their (maximal) subgroups with the unary operation within their maximal subgroups. As such they form a variety whose lattice of subvarieties is denoted by . We construct a 60-element -subsemilattice and a 38-element sublattice of . The bulk of the paper consists in establishing the necessary joins for which it uses Polák’s theorem.
A short proof of Rédei's Theorem.