2 papers
math.GR2021
Cancellable elements of the lattice of monoid varieties
Sergey V. Gusev, Edmond W. H. Lee
The set of all cancellable elements of the lattice of semigroup varieties has recently been shown to be countably infinite. But the description of all cancellable elements of the l…
math.GR2020
Varieties of monoids with complex lattices of subvarieties
Sergey V. Gusev, Edmond W. H. Lee
A variety is finitely universal if its lattice of subvarieties contains an isomorphic copy of every finite lattice. Examples of finitely universal varieties of semigroups have been…