All Solid Varieties of Semigroups
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Libor Polรกk
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Article
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1999
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Elsevier Science
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English
โ 131 KB
A solid variety is a variety in which every identity holds as a hyperidentity, that is, we substitute not only elements for the variables but also term operations for the operational symbols. There are obvious necessary conditions for a variety of semigroups to be solid. We will show here that these