theorem Count0:
  for a be non trivial Nat, b be non zero Nat holds
    a|^(a |-count b) <= b
  proof
    let a be non trivial Nat, b be non zero Nat;
    a <> 1 by Def0; then
    a|^(a |-count b) divides b by NAT_3:def 7;
    hence thesis by NAT_D:7;
  end;
