On a question of Pultr regarding categories of structures
On a relationship between monoids and monounary algebras
On a representation of groupoids as sums of directed systems
On a Representation of Lattices by Congruence Relations
On a representation of monounary algebras
In this note we deal with a question concerning monounary algebras which is analogous to an open problem for partially ordered sets proposed by Duffus and Rival.
On a representation of semigroups by products of algebras and relations
On a simple one-element extension of left zero semigroups
On a theorem of Šutov.
On a variety of infinite algebras
On algebraic lattices and semisimple algebras
On algebraic operations of a lattice-ordered group
On algebra-lattices
On Algebras all of Whose Subalgebras are Simple; Some Solutions of Plonka's Problem
On algebras and clones.
On algebras having at most two algebraic operations depending on variables
On algebras of relations
On algebras with bases of different cardinalities
On another two cryptographic identities in universal Osborn loops.
On atoms in lattices of primitive classes
On automorphism groups of planar lattices
The structure of automorphisms of planar lattices is analyzed.