[Merged by Bors] - refactor(set_theory/ordinal_arithmetic): Rename power to opow

[vihdzp]

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[alexjbest]

If you still have the branch you were testing this out on it would be good to know if changing the name and making these defs lemmas protected lemma (so they have to be referred to by their full name ordinal.pow) would work. That would be my instinct for how to proceed when we have name clashes in mathlib normally

[robertylewis]

Ahh. Power names are annoying, because there are various different powers that don't really generalize. In other corners of the library, it seems like the pattern is to use the name {x}pow: rpow on the reals, zpow on groups, ... so maybe ordinal powers should be opow?

[vihdzp]

Ahh. Power names are annoying, because there are various different powers that don't really generalize. In other corners of the library, it seems like the pattern is to use the name {x}pow: rpow on the reals, zpow on groups, ... so maybe ordinal powers should be opow?

This seems like a good idea, although I'd like some more consensus before implementing it. Maybe @digama0 can weigh in?

[digama0]

I'm fine with renaming it to opow.

[sgouezel]

bors r+
Thanks!

[bors]

Pull request successfully merged into master.

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