3 research outputs found
Strongly nonfinitely based monoids
We show that the 42-element monoid of all partial order preserving and
extensive injections on the 4-element chain is not contained in any variety
generated by a finitely based finite semigroup.Comment: 12 pages. In version 2: the proofs of two key lemmas are expanded;
two remarks are added; references are updated; a few typos and language
errors are fixe