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Top Questions

Can you flip the end of a large exotic $\mathbb{R}^4$

differential-topology smooth-manifolds 4-manifolds gt.geometric-topology open-problem asked Mar 21, 2011 at 8:32

mathoverflow.net

What's the Kirby Diagram of a universal $\mathbb{R}^4$?

differential-topology smooth-manifolds 4-manifolds gt.geometric-topology open-problem asked Feb 2, 2011 at 22:53

mathoverflow.net

How do metrics behave under joining along a manifold embedded in the boundary?

differential-topology smooth-manifolds mg.metric-geometry gt.geometric-topology reference-request asked Mar 14, 2011 at 7:30

mathoverflow.net

Top Answers

More open problems

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Theoretical physics: Why not just $\mathbb{R}^4$?

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Reading list for basic differential geometry?

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Slice knots and exotic $\mathbb R^4$

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Path integrals outside QFT

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What mathematical treatment is there on the renormalization group flow in a space of Lagrangians?

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What would you want to see at the Museum of Mathematics?

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Intuitive crutches for higher dimensional thinking

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Smooth structures on the connected sum of a manifold with an Exotic sphere

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Stable graphs: Feynman diagrams and Deligne-Mumford space

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Best online mathematics videos?

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Is there a relation between 4-dimensional general relativity and exotic smooth structures on $\mathbb{R}^4$?

mathoverflow.net

Applications of finite continued fractions

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Data sets from motion capture?

opendata.stackexchange.com

What is Quantization ?

mathoverflow.net