[issue23185] add inf and nan to math module

[Mark Dickinson]

Mark Dickinson added the comment:

> float("-inf") and -float("inf") have exactly the same IEEE 754 representation

Indeed: there's only one negative infinity (and only one positive infinity) in IEEE 754 binary64 format.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23185>
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