Arworn, S.; Gyurov, B.; Nupo, N.; Panma, S.
(Algebra and Discrete Mathematics, 2018)
Let Cay(S,A) denote the Cayley digraph of the semigroup S with respect to the set A, where A is any subset of S. The function f : Cay(S,A) → Cay(S,A) is called an endomorphism of Cay(S,A) if for each (x, y) ∈ E(Cay(S,A)) ...