Reidemeister- Schreier type rewriting for semigroups.
Relational morphisms and operations on recognizable sets
Relations between cross-connections and biordered sets.
Relations Invariant under semigroup actions.
Relations on a lattice of varieties of completely regular semigroups
Completely regular semigroups are considered here with the unary operation of inversion within the maximal subgroups of the semigroup. This makes a variety; its lattice of subvarieties is denoted by . We study here the relations and relative to a sublattice of constructed in a previous publication. For being any of these relations, we determine the -classes of all varieties in the lattice as well as the restrictions of to .
Relations on the lattice of congruences of a regular semigroup.
Relationship between the inverse transversals of a regular semigroup.
Relationships between conbinatorics and 0-simple semigroups.
Relative Act Ideals
Relative block semigroups and their arithmetical applications
We introduce relative block semigroups as an appropriate tool for the study of certain phenomena of non-unique factorizations in residue classes. Thereby the main interest lies in rings of integers of algebraic number fields, where certain asymptotic results are obtained.
Relatively f-disjunctive languages.
Relatively free *-bands.
Remark on one-sided -ideals of semigroups
Remark on partial mappings
Remark on partially ordered sets, universal algebras and semigroups
Remark on the smallest semilattice congruence.
Remarks on 0-minimal quasi-ideals in semigroups.
Remarks on isomorphisms of regressive transformation semigroups.
Remarks on Maximal Left Ideals in Semigroups.
Remarks on the structure of the multiplicative monoid of integers modulo m.