Each regular code is included in a maximal regular code
E-free objects and E-locality for completely regular semigroups.
Elementary orthodox semigroups.
Elementary semigroups.
Elimination of generators in partially commutative structures. (Élimination de générateurs dans les structures partiellement commutatives.)
Embedding any countable semigroups in a 2-generated congruence-free semigroup.
Embedding semigroups in groups. A geometrical approach.
Embedding semigroups in nilpotent-generated semigroups
Embedding semigroups into semigroups with countability index two.
Equations and dot-depth one.
Équations dans les monoïdes libres
Après une introduction de caractère historique, l'auteur expose succinctement les principaux résultats qu'il a obtenus (thèse, Paris 1969) dans le domaine jusqu'alors pratiquement inexploré des équations dans les monoïdes libres.
Equations on the semidirect product of a finite semilattice by a finite commutative monoid.
Equidivisible Kleene monoids and the Elgot-Mezei theorem.
Equipotence et unicité de systems générateurs minimaux dans certains monoides.
E-varieties of regular semigroups, relatively bifree objects and fully invariant congruences.
Every braid admits a short sigma-definite expression
A result by Dehornoy (1992) says that every nontrivial braid admits a -definite expression, defined as a braid word in which the generator with maximal index appears with exponents that are all positive, or all negative. This is the ground result for ordering braids. In this paper, we enhance this result and prove that every braid admits a -definite word expression that, in addition, is quasi-geodesic. This establishes a longstanding conjecture. Our proof uses the dual braid monoid and a new...
Every subsemigroup of a free semigroup with zero is not an R-semigroup.
Exchange properties and basis properties for closure operators
Expletives in languages and middle units in semigroups.