
theorem Th41:
  for x,b being non pair set holds x in InputVertices BitCompStr(x
  ,b) & b in InputVertices BitCompStr(x,b)
proof
  let x,b be non pair set;
  InputVertices BitCompStr(x,b) = {x,b} by Th40;
  hence thesis by TARSKI:def 2;
end;
