The structure of commutative ideal semigroups.
The subalgebra lattice of a finite algebra
The aim of this paper is to characterize pairs (L, A), where L is a finite lattice and A a finite algebra, such that the subalgebra lattice of A is isomorphic to L. Next, necessary and sufficient conditions are found for pairs of finite algebras (of possibly distinct types) to have isomorphic subalgebra lattices. Both of these characterizations are particularly simple in the case of distributive subalgebra lattices. We do not restrict our attention to total algebras only, but we consider the more...
The subalgebra lattice of a Heyting algebra
The submaximal clones on the three-element set with finitely many relative R-classes
For each clone C on a set A there is an associated equivalence relation analogous to Green's R-relation, which relates two operations on A if and only if each one is a substitution instance of the other using operations from C. We study the maximal and submaximal clones on a three-element set and determine which of them have only finitely many relative R-classes.
The theory of abstract algebras with infinitary operations [Book]
The theory of core algebras: its completeness.
The variety generated by tournaments
The weak hereditary class of a variety
We study the weak hereditary class of all weak subalgebras of algebras in a total variety . We establish an algebraic characterization, in the sense of Birkhoff’s HSP theorem, and a syntactical characterization of these classes. We also consider the problem of when such a weak hereditary class is weak equational.
The weak subalgebra lattice of a unary partial algebra of a given infinite unary type
The word problem for regular identities
The zero-completion of a median algebra
Théorie des magmoïdes
Théorie des magmoïdes (I)
Theory of computing systems
Theory of equidistance and betweenness relations in regular metric spaces
T-independence in distributive lattices
Tolerance distributive and tolerance Boolean varieties of semigroups
Tolerance distributive and tolerance modular varieties of commutative semigroups
Tolerance in algebraic structures. II
Tolerance lattice of algebras with restricted similarity type