theorem Th4:
  for I being Instruction of Trivial-COM holds JumpPart I = 0
proof
  let I be Instruction of Trivial-COM;
  the InstructionsF of Trivial-COM = {[0,0,0]} by Def1;
  then I = [0,0,0] by TARSKI:def 1;
  hence thesis;
end;
