leanprover-community / sphere-eversion

Formalization of the existence of sphere eversions
https://leanprover-community.github.io/sphere-eversion/
Apache License 2.0
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Add proof of `lem:smooth_surrounding` #41

Closed ocfnash closed 2 years ago

ocfnash commented 2 years ago

Experimenting with a "Sphere Eversion repo first, Mathlib second" policy --- it is satisfyingly faster to write code this way :-)

As I commented on Zulip "I have not really tried to combat some grossness in the proposed new file src/loops/smooth_barycentric.lean. I'm happy to polish this up too but I thought I'd request feedback first since we might be OK to leave the code there in a not-amazing-but-OK state and just move on to other things."