
theorem
  for n be non zero Nat for x be Tuple of n,BOOLEAN holds n
  -BinarySequence (Absval x) = x
proof
  let n be non zero Nat;
  let x be Tuple of n,BOOLEAN;
  Absval x < 2 to_power n by Th1;
  then Absval (n-BinarySequence Absval x) = Absval x by Th35;
  hence thesis by Th2;
end;
