[issue37893] pow() should disallow inverse when modulus is +-1

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> Z/1Z is a perfectly-well-defined ring.

More to the point, it's a perfectly well-defined ring in which every element is invertible. That's why the Euler phi function has phi(1) = 1 (rather than phi(1) = 0), for example.

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<https://bugs.python.org/issue37893>
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