Distributive and neutral elements of the lattice of commutative semigroup varieties
V. Yu. Shaprynskiǐ · Russian Mathematics · 2011
We completely describe commutative semigroup varieties that are distributive, standard, or neutral elements of the lattice of all commutative semigroup varieties. In particular, we prove that the properties of being a distributive element and of being a standard element in this lattice are equivalent.