Every group is a maximal subgroup of the semigroup of relations
Every subsemigroup of a free semigroup with zero is not an R-semigroup.
Exchange properties and basis properties for closure operators
Existence of joins and meets in the partially ordered family of CM-homomorphisms.
Expletives in languages and middle units in semigroups.
Exponential ....-semigroups.
Extending a partial equivalence to a congruence and relative embeddings in universal algebras
Extending congruences on factors of ideally compactifiable semigroups.
Extending partial isomorphisms and McAlister's covering theorem.
Extension of additive functionals and semicharacters on commutative semigroups.
Extension of Characters on *-Semigroups.
Extension theories for monoids.
Extensions de demi-groupe inverses.
Extensions idéales strictes et pures d'un demi-groupe
Extensions normales de demi-groupes inverses
Extensions of an arbitrary semigroup.
Extensions of Bauer's identical congruences
Extensions of Certain Homomorphisms of Subsemi-groups to Homomorphisms of Groups
Extensions of homomorphisms of subsemigroups of a group.
Extensions of homomorphisms to dense extensions of semigroups.