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Complex, contact, Riemannian, pseudo-Riemannian and Finsler geometry, relativity, gauge theory, global analysis.

16 votes
2 answers
754 views

Can a sphere glued into a soft 3d-mattress rotate continuously? (manifolds, SU(2) and the be...

The question is triggered by the wonderful animations by Jason Hise: https://www.youtube.com/watch?v=LLw3BaliDUQ https://www.youtube.com/watch?v=6Ul_-ABYaYU https://www.youtube.com/watch?v=aYVt1U …
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