Some results on congruences on semihypergroups.
Span in incidence structures of independent sets defined on projective space
Special congruence triples for a regular semigroup.
Special incidence structures of type
Special incidence structures of type . II.
Special types of universal algebras preserving a relation
Standard cohomology of semigroups
Statistical linear spaces. I. Properties of , -topology
Statistical linear spaces. II. Strongest -norm
Strictly order primal algebras.
Strong embedding of category of all groupoids into category of semigroups
Strong endomorphism kernel property for finite Brouwerian semilattices and relative Stone algebras
We show that all finite Brouwerian semilattices have strong endomorphism kernel property (SEKP), give a new proof that all finite relative Stone algebras have SEKP and also fully characterize dual generalized Boolean algebras which possess SEKP.
Strong endomorphism kernel property for monounary algebras
All monounary algebras which have strong endomorphism kernel property are described.
Strong P-congruences on P-regular semigroups.
Strong regular varieties of partial algebras I
Strong retracts of unary algebras
This paper introduces the notion of a strong retract of an algebra and then focuses on strong retracts of unary algebras. We characterize subuniverses of a unary algebra which are carriers of its strong retracts. This characterization enables us to describe the poset of strong retracts of a unary algebra under inclusion. Since this poset is not necessarily a lattice, we give a necessary and sufficient condition for the poset to be a lattice, as well as the full description of the poset.
Structure of free algebras
Structures Algebraiques munis, avec des lois de composition generalisees - Generalisations du produit scalaire
Structures naturelles des demi-groupes et des anneaux réguliers ou involutés
Certaines relations binaires sont définies sur les demi-groupes et les demi-groupes à involution. On examine comment elles peuvent en ordonner les éléments: notamment les idempotents, les éléments réguliers au sens de von Neumann, ceux qui possédent un inverse ponctuel ou de Moore-Penrose ; et en fonction aussi de conditions sur l'involution. Ces relations peuvent alors coïncider avec les ordres naturels des idempotents et des demi-groupes inverses, avec les ordres de Drazin et de Hartwig : elles...
Subalgebra extensions of partial monounary algebras
For a subalgebra of a partial monounary algebra we define the quotient partial monounary algebra . Let , be partial monounary algebras. In this paper we give a construction of all partial monounary algebras such that is a subalgebra of and .