On subgroupoid lattices of some finite groupoid.
On substitution of operations in systems of equations over algebras
On sums in generalized algebraic categories
On surjective kernels of partial algebras.
On symmetries and parallelogram spaces.
The notion of a TST-space is introduced and its connection with a parallelogram space is given. The existence of a TST-space is equivalent to the existence of a parallelogram space, which is a new characterization of a parallelogram space. The structure of a TST-space is described in terms of an abelian group.
On synchronized relatively full embeddings and -universality
On systems of mappings between models
On -fuzzy ideals in nearrings.
On ternary semigroups of homomorphisms of ordered sets
The paper deals with the characterization of ordered sets by means of ternary semigroups of homomorphisms of ordered sets.
On the adjointness between operations and relations and its impact on atomic compactness
On the approximation of the Boolean powers by Cartesian powers
On the arity of affine modules
On the arity of idempotent reduct of abelian groups
On the arity of idempotent reducts of groups
On the associative Nijenhuis relation.
On the Boundedness of Topological Categories.
On the characterisation of Mal'tsev and Jónsson-Tarski algebras
There are very strong parallels between the properties of Mal'tsev and Jónsson-Tarski algebras, for example in the good behaviour of centrality and in the factorization of direct products. Moreover, the two classes between them include the majority of algebras that actually arise 'in nature'. As a contribution to the research programme building a unified theory capable of covering the two classes, along with other instances of good centrality and factorization, the paper presents a common framework...
On the characterization of a certain class of monounary algebras
On the characterization of Jonsson-Tarski and of subtractive varieties
On the characterization of primal partial algebras by strong regular hyperidentities.