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daynthelife | 6 months ago

I am confused how we can define a rotation number of the map from S^1 to R^3 defined at the end of the second paragraph. R^3 is nullhomotopic, after all...

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ajkjk|6 months ago

I think the idea is that you can't, but we're assuming v doesn't vanish at that point which would imply that it's possible?