Arworn, S.; Gyurov, B.; Nupo, N.; Panma, S.
(ДЗ "ЛНУ імені Тараса Шевченка", 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 endo-morphism of Cay(S, A) if for each (x, y) ∈ E(Cay(S, ...