> Given: x not equal to 0, y not equal to 0, Prove: x + y = 0. > > Since x does not equal 0, then x + 1 does not equal 1, x + a does not > equal a, x + y does not equal y. > But what is y? y is anything but 0. > Thus x + y is not equal to anything but 0. > Since x + y cannot equal anything but 0, x + y = 0. > > Q.E.D.
eh, that was cool! :)
