2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/76094Pairwise non-isomorphic semigroups obtained from the finite inverse symmetric semigroup $\mathcal{IS}_n ,$ finite symmetric semigroup $\mathcal{T}_n$ and bicyclic semigroup by the deformed multiplication proposed by Ljapin are classified.7 pagesRings and AlgebrasGroup Theory20M20text