Quasi-discriminator varieties

PAOLI, FRANCESCO;LEDDA, ANTONIO;Kowalski T.;Spinks M.

2014-01-01

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Abstract

We generalize the notion of discriminator variety in such a way as to capture several varieties of algebras arising mainly from fuzzy logic. After investigating the extent to which this more general concept retains the basic properties of discriminator varieties, we give both an equational and a purely algebraic characterization of quasi-discriminator varieties. Finally, we completely describe the lattice of subvarieties of the pure pointed quasi-discriminator variety, providing an explicit equational base for each of its members.