Futility Closet

Proof That -1 Is Positive

Posted in Science & Math by Greg Ross on December 16th, 2008

Let

proof that -1 is positive

Clearly S is positive. Now multiply each side by 2:

proof that -1 is positive

But that’s just the same as S minus 1.

And if 2S = S – 1, then S = -1.

So -1 is positive.