[issue26114] Rewrite math.erf() and math.erfc() from scratch

[Mark Dickinson]

Mark Dickinson added the comment:

@Serhiy: Sure, that would work (the same way that we do for log1p). I *think* I tried this at the time, but it turns out that some libm implementations of erf and erfc are pretty bad, so our tests failed. (But I may be misremembering.)

In any case, the proposal to use the libm erf/erfc should be a separate issue, I think.

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<http://bugs.python.org/issue26114>
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