[PDF][PDF] On saturated semigroups

N Alam - Journal of Abstract and Computational Mathematics, 2019 - researchgate.net
We show that the class of permutative semigroups (medial semigroups) satisfying the
homotypical identity [axy= axay] is saturated and, as a corollary, we found that an externally …

Epimorphisms, dominions, closed and absolutely closed semigroups

N Alam, NM Khan - Asian-European Journal of Mathematics, 2017 - World Scientific
Firstly, we show that the variety of all left (right) regular bands and the variety of all normal
bands are closed in the variety of all left (right) semiregular bands and the variety of all …