Regularity in arithmetical varieties
Regularity in p-algebras and p-semilattices
Regularity of algebras with applications to congruence class geometry
Regularity of the wreath product of monoids.
Relation products of congruences and factor congruences
Relational characterizations of permutable and -permutable varieties
Relational classes and their characterizations
Relational structures and dependence spaces
Relations and topologies
Relations, coverings, hypergraphs and matroids
Relations on the lattice of congruences of a regular semigroup.
Relations With I-structure in Categories With Pullbacks
Relative Complements in the Weak Congruence Lattice
Relative congruence distributivity within quasivarieties of nearly associative Φ-algebras
Relatively free *-bands.
Relatively free lattices
Relatively pseudocomplemented directoids
The concept of relative pseudocomplement is introduced in a commutative directoid. It is shown that the operation of relative pseudocomplementation can be characterized by identities and hence the class of these algebras forms a variety. This variety is congruence weakly regular and congruence distributive. A description of congruences via their kernels is presented and the kernels are characterized as the so-called -ideals.
Remark on partially ordered sets, universal algebras and semigroups
Remarks on algebras having two bases of different cardinalities
Remarks on C-independence in Cartesian products of abstract algebras