Varieties of bands
The author surveys the main descriptions of the lattice of varieties of bands (semigroups that consist of idempotents) and its variants, the varieties of band monoids, of *-bands and of *-band monoids. The original description of the lattice of varieties of bands is rightly termed ``probably the best single achievement in the theory of varieties ... of semigroups ...''. The paper should serve as a useful reference, as it contains diagrams of all the relevant lattices and contains terse definitions of the identities involved.NEWLINENEWLINEFor the entire collection see [Zbl 0954.00028].
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