On algebras of relations
On algebras with bases of different cardinalities
On atoms in lattices of primitive classes
On automorphisms of computability potential scales for -element algebras.
On automorphisms of the lattice of quasivarieties of lattice-ordered groups
On bases of completely simple semigroups identities.
On basic and axiomatic ranks of nilpotent varieties of Lie algebras
On categories of structures and classes of algebras [Book]
On classes of algebras definable by regular equations
On clones determined by their initial segments
On completions of partial monounary algebras
On congruence distributivity of ordered algebras with constants
We define the order-congruence distributivity at 0 and order- congruence n-distributivity at 0 of ordered algebras with a nullary operation 0. These notions are generalizations of congruence distributivity and congruence n-distributivity. We prove that a class of ordered algebras with a nullary operation 0 closed under taking subalgebras and direct products is order-congruence distributive at 0 iff it is order-congruence n-distributive at 0. We also characterize such classes by a Mal'tsev condition....
On congruence lattices in a category
On congruences in direct sums of algebras
On connections between the decomposition of an algebra into sums of direct systems of subalgebras
On convexities of lattices
On covariety lattices
This paper shows basic properties of covariety lattices. Such lattices are shown to be infinitely distributive. The covariety lattice of subcovarieties of a covariety K of F-coalgebras, where F:Set → Set preserves arbitrary intersections is isomorphic to the lattice of subcoalgebras of a -coalgebra for some cardinal κ. A full description of the covariety lattice of Id-coalgebras is given. For any topology τ there exist a bounded functor F:Set → Set and a covariety K of F-coalgebras, such that...
On covers in the lattice of representable -varieties
On cross semigroup varieties and related questions.
On direct limit classes of algebras