A theorem on binary relations and infinite languages.
A theory of transformation monoids: combinatorics and representation theory.
About the finiteness of monoids generated by closures and interiors.
Action of topological semigroups, invariant means, and fixed points
Actions of a noncompact semigroup with zero.
Actions of semilattices.
Addendum to "A survey of semigroups of continuous selfmaps" (with intro. by K. D. Magill).
Additional notes on continuity in semitopological semigroups.
Admissible transformations of measures.
Algebraic monoids with a dense group of units.
Algebraic monoids with group kernels.
An algebraic treatment of flow diagrams and its application to generalized recursion theory
An embedding theorem for semigroups of continuous selfmaps.
Another semigroup characterization of the simple closed curve.
Another semigroup of complexity n-1.
Applications multiformes partielles.
Automorphism invariants for semigroups.
Automorphisms of linear semigroups over division rings.
Automorphisms of polynomial semigroups.
Balanced subsets of a symmetric inverse semigroup.