Arithmetical semigroups defined by congruences.
Arithmetical theory of monoid homomorphisms.
Artin-Gruppen und Coxeter-Gruppen.
Associativity in monoids and categories
Atanassov’s Intuitionistic Fuzzy Ideals of Po--Semigroups
Atomicity of tolerance lattices of commutative semigroups
Atomistic congruence lattices of semilattices.
Augmentations and wreath products of monoids.
Automata accepting primitive words.
Automates et commutations partielles
Automorphism invariants for semigroups.
Automorphisms of linear semigroups over division rings.
Automorphisms of polynomial semigroups.
Automorphisms of the semigroup of finite complexes of locally finite groups.
Autonomous automata and closures with the same endomorphism monoids