Cancellable elements of the lattices of varieties of semigroups and epigroups
arXiv:1810.01610
Abstract
We completely determine all semigroup [epigroup] varieties that are cancellable elements of the lattice of all semigroup [respectively epigroup] varieties.
17 pages, 3 figures. Compared with the previous version, we add Corollary 1.4 and Figure 1 and fix several typos. arXiv admin note: text overlap with arXiv:1806.05972