We have shown that a variety of left (right) normal bands is closed in some homotypical
varieties. Further, we partially generalize a result of Isbell from the class of commutative …

The complete characterization of saturated varieties of semigroups remains an unsolved
problem. The primary objective of this paper is to make significant progress in this direction …

In this paper, we discussed some saturated classes of ℋ‐commutative semigroups, left
(right) regular semigroups, medial semigroups, and paramedial semigroups. The results of …

Some results on certain types of Putcha semigroups Skip to content Should you have
institutional access? Here's how to get it ... De Gruyter € EUR - Euro £ GBP - Pound $ USD …

In this paper, we partially generalize a result of Isbell from the class of commu-tative
semigroups to some generalized class of commutative semigroups by showing that …

In this paper, first we have shown that all the homotypical varieties defined by the identities
axy= xyax, axy= xxya and axy= yaxx are closed. Further, we partially generalize a result of …

It is known that all subvarieties of variety of all semigroups are not absolutely closed. So, it is
a natural question to find out those subvarieties of variety of all semigroups that are closed in …

We prove first that every H H-commutative semigroup is stable. Using this result and some
results from the standard text (Nagy, Special classes of semigroups, Kluwer, Dordrecht …