reserve a, b, c, d, e for Complex;

theorem
  a"*(c/b) = c/(a*b)
proof
  thus a"*(c/b) = a"*(c*b") by XCMPLX_0:def 9
    .= c*(a"*b")
    .= c*(a*b)" by Lm1
    .= c/(a*b) by XCMPLX_0:def 9;
end;
