Introduzione

EnWe study the semigroups B (S) of the bi-ideals of a semigroup S and obtain characterizations of some classes of orthogroups. Further we prove the existence of an isomorphism between B (S) and B (E) when E is the band of the idempotents of an orthogroups S

Bibliografia

Abstract

Bibliografia

Abstract

Bibliografia

Abstract

Introduzione

EnWe study the semigroups B (S) of the bi-ideals of a semigroup S and obtain characterizations of some classes of orthogroups. Further we prove the existence of an isomorphism between B (S) and B (E) when E is the band of the idempotents of an orthogroups S

Bibliografia

Abstract

On left univocal factorizations of semigroups

We should like to construct all the semigroups that have a left univocal factorization with factors to pair (A,B) of prescribed semigroups such that their intersections consists of only one element, that is right identity of A and left identity of B

Upper Subrings of a Ring

We describe maximal ideals of rings that are contained in the adjoint groups of their upper subrings.Описано максимальні ідеали кілець, що містяться в приєднаних групах їхніх верхніх кілець