S-sets and semigroups of quotients.
Subtraction semigroups
A subtraction semigroup is a semigroup with a further operation "" added, called subtraction and satisfying certain axioms. The paper concerns a problem by B. M. Schein concerning the structure of multiplication in a subtraction semigroup.
Sur les automorphismes du demi groupe des applications d'un ensemble dans lui-même
Sur mon article 'une topologie du monoide libre".
Sur une forme de familles de fonctions commutatives
Symmetry classes of tensors via semigroup operands.
Symons’ -congruence on sandwich semigroups
The a-congruences on S(X) and the S-equivalences on X.
The algebra of the subspace semigroup of
The semigroup of subspaces of the algebra of 2 × 2 matrices over a finite field is studied. The ideal structure of S, the regular -classes of S and the structure of the complex semigroup algebra ℂ[S] are described.
The alternating semigroups: Generators and congruences.
The automorphism group of the graph of an R class.
The average rank of a product of transformations.
The cardinal and the idempotent number of various monoids of transformations on a finite chain.
The commutativity relation in the symmetric semigroup.
The compression semigroup of a cone is connected.
The congruences on S(X) which commute with V.
The core congruence on a monoid.
The Euler-Fermat theorem for the semigroup of circulant Boolean matrices
The factorizable transformation semigroups.
The group of units as a maximal inverse subsemigroup.