let C be Category; ( C is Categorial implies C is with_triple-like_morphisms )
assume A1:
C is Categorial
; C is with_triple-like_morphisms
then A2:
the carrier of C is categorial
by Def6;
let f be Morphism of C; CAT_5:def 1 ex x being set st f = [[(dom f),(cod f)],x]
reconsider A = dom f, B = cod f as Category by A2, Def5;
ex F being Functor of A,B st f = [[A,B],F]
by A1, Def6;
hence
ex x being set st f = [[(dom f),(cod f)],x]
; verum