[issue12345] Add math.tau

[Benjamin Peterson]

Benjamin Peterson <benjamin at python.org> added the comment:

2011/6/16 STINNER Victor <report at bugs.python.org>:
>
> STINNER Victor <victor.stinner at haypocalc.com> added the comment:
>
>> Actually, I've heard there are an infinity of them.
>
> Can you prove that?

Don't have to. Axiom of infinity. :)

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