On lattices embeddable into subsemigroup lattices. III: Nilpotent semigroups.
On left distributive left idempotent groupoids
We study the groupoids satisfying both the left distributivity and the left idempotency laws. We show that they possess a canonical congruence admitting an idempotent groupoid as factor. This congruence gives a construction of left idempotent left distributive groupoids from left distributive idempotent groupoids and right constant groupoids.
On locally small based algebraic theories
On medial local semigroups.
On middle universal weak and cross inverse property loops with equal length of inverse cycles.
On minimization theorems for polyadic groups H-derived from groups
On modularity in lattices of congruences on ordered sets
On non-associative groupoids
On normal Agassiz systems of algebras
On one problem in the theory of partial monounary algebras
On permutability in semigroup varieties
The paper contains characterizations of semigroup varieties whose semigroups with one generator (two generators) are permutable. Here all varieties of regular -semigroups are described in which each semigroup with two generators is permutable.
On prime binary relational structures
On products in generalized algebraic categories
On products of binary relational structures
On pseudocomplemented semilattices with Stone congruence lattices
On Quasi Primal Algebras.
On quasi-algebras and the word problem.
On quasivarieties of partial algebras, their generation and their subquasivarieties. I
On quasivarieties of partial algebras, their generation and their subquasivarieties II
On reduction theorems in the problem of composition of functions