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for questions about fiber bundles, including structure groups, principal bundles, and spaces of sections.

2 votes

Explicitly describing the region of the plane "outward of" a simple, open, oriented, cubic c...

The interesting curve you discovered is the envelope of the normals to the curve and is called an evolute. More precisely, the curves that bound your region of interest are portions of the evolute of …
Iddo Hanniel's user avatar