Python fails on math

Ian Kelly ian.g.kelly at
Tue Feb 22 13:29:04 EST 2011

On Tue, Feb 22, 2011 at 9:54 AM, David C. Ullrich <dullrich at> wrote:
> Anyway, I don't know why you're jumping to the conclusion that it's
> Python that's wrong here. Could be the math you learned in school
> is wrong. I mean you're assuming that
> (*)       a(b+c) = ab + ac
> but what makes you so certain (*) is correct? Have you tried it with
> every possible value of a, b, and c? Or do you just blindly believe
> everything your teacher told you or what?
> Seems to me you've stumbled on a counterexample to (*). I'm
> gonna have to take this up with the mathematicians...

Or you could, you know, just check the proof:

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