
theorem Th5:
  for I being non degenerated commutative non empty multLoopStr_0
  for u being Element of Q.I holds u in QClass.u
proof
  let I be non degenerated commutative non empty multLoopStr_0;
  let u be Element of Q.I;
  u`1 * u`2 = u`1 * u`2;
  hence thesis by Def4;
end;
