can be strongly embedded into category of semigroups
-classes in the direct product of two semigroups
-classes of inverse semigroups.
-Prime Subsets in Semigroups
(0,1) - Matrices and semigroups of ring endomorphisms.
*-Bisimple type A w-semigroups-1.
...-classes in ....-unipotent Semigroups.
*-Congruences on regular *-semigroups.
...-length of union of groups semigroups.
(Pre)order preserving additive homomorphisms of (pre)ordered commutative semigroups into real numbers
.....-simple reflective semigroups.
*-Simple type A ...-semigroups.
[unknown]
A regular hypersubstitution is a mapping which takes every -ary operation symbol to an -ary term. A variety is called regular-solid if it contains all algebras derived by regular hypersubstitutions. We determine the greatest regular-solid variety of semigroups. This result will be used to give a new proof for the equational description of the greatest solid variety of semigroups. We show that every variety of semigroups which is finitely based by hyperidentities is also finitely based by identities....
-group congruences on regular -semigroups.
-reflexive semigroup and rings
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