MALAYSIAN JOURNAL OF MATHEMATICAL SCIENCES, cilt.14, sa.3, ss.351-371, 2020 (ESCI)
In this article, we present the concepts of almost m-ideals, generalized almost m-ideals, fuzzy almost m-ideals, and fuzzy generalized almost m-ideals. We present the results illustrating their mutual differences and similarities. Along these lines, we bring about their examples and
then characterize semigroups through their properties. One of the distinguished properties of the almost m-ideals respectively the related objects is that their intersection is not an almost m-ideal respectively related
objects, while their union is. A subsemigroup of a semigroup is the almost m-ideals if and only if its characteristic function is the fuzzy almost
m-ideals. Through these four closely related concepts of m-ideals, we
show that this field will open new avenues of research and applications
of semigroups