2 papers
math.GR2026
Embedding ample semigroups as (2,1,1)-subalgebras of inverse semigroups
Nasir Sohail, Aftab Hussain Shah, Kristo Väljako
The problem of embedding an ample semigroup in an inverse semigroup as a (2, 1, 1)-type subalgebra is known to be undecidable. In this article, we investigate the problem for certa…
math.GR2025
Epimorphisms and pseudovarieties
Jorge Almeida, Aftab Hussain Shah
For each of the following conditions, we characterize the pseudovarieties of semigroups V that satisfy it: (i) every epimorphism to a member of V is onto; (ii) every epimorphism to…