A function f : 77, ---, 77 m is said to be congruence preserving if for all d dividing m and a,b C {0, 1 . . . . . n 1}, a = b (modd) implies f ( a ) = f (b) (modd) , In previous work, Chen defines the notion of a polynomial function from Z, to 77m and shows that any such function must also be a congruence preserving function. Chen then raises the question… (More)