reserve D for non empty set,
  f for FinSequence of D,
  p, p1, p2, p3, q for Element of D,
  i, j, k, l, n for Nat;

theorem
 for f being FinSequence, i be Nat, p be set
  holds rng Replace(f, i, p) c= rng f \/ {p} by FUNCT_7:100;
