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math.RA2024
On semigroups of orientation-preserving partial permutations with restricted range
De Biao Li, Vítor H. Fernandes
Let be a finite chain with elements , and let be the semigroup of all injective orientation-preserving partial transformations of $…
math.RA2022
Endomorphisms of semigroups of oriented transformations
De Biao Li, Vítor H. Fernandes
In this paper, we characterize the monoid of endomorphisms of the semigroup of all oriented full transformations of a finite chain, as well as the monoid of endomorphisms of the se…