On the UA-Properties of Abelian sp-Groups and Their Endomorphism Rings

Аннотация

An R-module A is said to be a UA-module if it is not possible to change the addition of A without changing the action of R on A. A semigroup (R, ·) is said to be a UA-ring if there exists a unique binary operation + making (R, ·, +) into a ring. In this paper, the UA-properties of sp-groups and their endomorphism rings are studied.