feat: Cobham Function Algebra - #899
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BoltonBailey wants to merge 16 commits into
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This PR adds Cobham's function algebra.
Zulip: https://leanprover.zulipchat.com/#narrow/channel/513188-CSLib/topic/Cobham.27s.20axioms/with/622656298
Claude code was used to make this PR.
See the Design notes section of the docstring for more thoughts. I have implemented something fairly close to Cobham's paper. I would argue that we should also implement the "polynomially bounded recursion on notation" version, but perhaps that's best left for a future PR.