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