reserve x for set;
reserve a, b, c, d, e for Real;
reserve m, n, m1, m2 for Nat;
reserve k, l for Integer;
reserve p for Rational;

theorem Th42:
 k <> 0 implies 0 to_power k = 0
 proof
   0 to_power k = 0 #Z k by Def2;
  hence thesis by PREPOWER:100;
 end;
