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In mathematics, a band (also called idempotent semigroup) is a semigroup in which every element is idempotent (in other words equal to its own square). Bands were first studied and named by A. H. Clifford (1954).
Music, Varieties of bands & Overview
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bands band rectangular semigroup identity lattice also every first varieties commutative xy semigroups idempotent satisfying variety magma doi displaystyle element
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