Proof that girls are evil

First we state that girls require time and money.

$Girls = Time \times Money$

And as we all know "time is money".

$Time = Money$

Therefore:

$Girls = Money \times Money$

And because "money is the root of all evil":

$Money = \sqrt{Evil}$

Therefore:

$Girls = (\sqrt{Evil})^2$

And we are forced to conclude that:

$G i r l s = E v i l$