reserve i, j, k, l, m, n, t for Nat;

theorem
  for n be non zero Nat st n <> 1 holds n > 1
proof
  let n be non zero Nat;
A1: n >= 1 by NAT_1:14;
  assume n <> 1;
  hence thesis by A1,XXREAL_0:1;
end;
