[issue3366] Add gamma and error functions to math module

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Why isn't tgamma() simply named gamma()?  The t prefix does nothing for 
me except raise questions.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3366>
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