reserve Q,Q1,Q2 for multLoop;
reserve x,y,z,w,u,v for Element of Q;

theorem Th13:
  for f being homomorphic Function of Q1,Q2 holds
  for x,y being Element of Q1 holds f.(x \ y) = f.x \ f.y
proof
  let f be homomorphic Function of Q1,Q2;
  let x,y be Element of Q1;
  f.x * f.(x \ y) = f.(x * (x \ y)) by Def28b;
  hence thesis;
end;
