Geodesic
M-Solid Subvarieties of some Varieties of Commutative Semigroups
Serdica Mathematical Journal, Tome 23 (1997) no. 1, pp. 25-34.

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The basic concepts are M -hyperidentities, where M is a monoid of hypersubstitutions. The set of all M -solid varieties of semigroups forms a complete sublattice of the lattice of all varieties of semigroups. We fix some specific varieties V of commutative semigroups and study the set of all M -solid subvarieties of V , in particular, if V is nilpotent.
Keywords: Hypersubstitutions, M-Hyperidentity, M-Solid Subvarieties of Semigroups 
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Koppitz, J. M-Solid Subvarieties of some Varieties of Commutative Semigroups. Serdica Mathematical Journal, Tome 23 (1997) no. 1, pp. 25-34. http://geodesic.mathdoc.fr/item/SMJ2_1997_23_1_a2/