Some old and new problems in the independence theory
Special types of universal algebras preserving a relation
...-Strukturen.
Subalgebra lattices of unary algebras and an axiom of choice
Subcoherent algebras
Subdirect representations in axiomatic classes
Subdirectly irreducible algebras of quasiordered logics
Systems of equations and tolerance relations
The algebra of mode homomorphisms
Modes are idempotent and entropic algebras. While the mode structure of sets of submodes has received considerable attention in the past, this paper is devoted to the study of mode structure on sets of mode homomorphisms. Connections between the two constructions are established. A detailed analysis is given for the algebra of homomorphisms from submodes of one mode to submodes of another. In particular, it is shown that such algebras can be decomposed as Płonka sums of more elementary homomorphism...
The join of equational theories
The notion of an elementary subsystem for a Boolean-valued relational system
The refinement of two isomorphic generalized lexicographic products
The zero-completion of a median algebra
Tolerance in algebraic structures. II
Tolerance relation on lattices
Tolerance relations on complete lattices
Tolerance relations on simple ternary algebras
Tolerances and congruences on tree algebras
Tolerances and convexity
Tolerances, covering systems, and the axiom of choice