Výsledky vyhledávání - "V. Yu. Shaprynskiǐ"

Cancellable elements of the lattices of varieties of semigroups and epigroups

Autor: V. Yu. Shaprynskiǐ, Boris M. Vernikov, Dmitry V. Skokov

Publikováno v: Commun. Algebra
Communications in Algebra

We completely determine all semigroup [epigroup] varieties that are cancellable elements of the lattice of all semigroup [respectively epigroup] varieties.
Comment: 17 pages, 3 figures. Compared with the previous version, we add Corollary 1.4 an

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Lower-modular elements of the lattice of semigroup varieties. III

Autor: V. Yu. Shaprynskiǐ, B. M. Vernikov

We completely determine all lower-modular elements of the lattice of all semigroup varieties. As a corollary, we show that a lower-modular element of this lattice is modular.
Comment: 10 pages, 1 figure

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