Arithmetic infinite Grassmannians and the induced central extensions.
Arithmetic of non-principal orders in algebraic number fields
Let be an order in an algebraic number field. If is a principal order, then many explicit results on its arithmetic are available. Among others, is half-factorial if and only if the class group of has at most two elements. Much less is known for non-principal orders. Using a new semigroup theoretical approach, we study half-factoriality and further arithmetical properties for non-principal orders in algebraic number fields.
Arithmetic Properties of certain partially ordered Semigeroups.
Arithmetical characterizations of divisor class groups. II.
Arithmetical properties of finite rings and algebras, and analytic number theory. II.
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