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

theorem Th62: :: REAL_1'40_1
  a / c + b / c = (a + b) / c
proof
  thus a/c + b/c =a*c" + b/c by XCMPLX_0:def 9
    .= a*c" + b*c" by XCMPLX_0:def 9
    .= (a+b)*c"
    .= (a+b)/c by XCMPLX_0:def 9;
end;
