Let F be a field,n≥3,N(n,F) the strictly upper triangular matrix Lie algebra consisting of the n×n strictly upper triangular matrices and with the bracket
We introduce the concepts of left (right) zero-divisor rings, a class of rings without identity. We call a ring R left (right) zero-divisor if rR (a) = 0 (lR (a
In this paper,the concept of semiprimary fuzzy ideals of an ordered semigroup is introduced.Some characterizations for an ordered semigroup S to be a semilattic