Geodesic
Cancellable elements of the lattice of~semigroup~varieties
Algebra and discrete mathematics, Tome 26 (2018) no. 1, pp. 34-46.

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We completely determine all commutative semigroup varieties that are cancellable elements of the lattice SEM of all semigroup varieties. In particular, we verify that a commutative semigroup variety is a cancellable element of the lattice SEM if and only if it is a modular element of this lattice.
Mots-clés : semigroup, variety, cancellable element of a lattice, modular element of a lattice. 
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Sergey V. Gusev; Dmitry V. Skokov; Boris M. Vernikov. Cancellable elements of the lattice of~semigroup~varieties. Algebra and discrete mathematics, Tome 26 (2018) no. 1, pp. 34-46. https://geodesic-test.mathdoc.fr/item/ADM_2018_26_1_a4/

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