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# Questions

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### Homogeneous metrics of given volume element, on the n-sphere.

jul 24 at 4:13 Robert Bryant 21.8k37597

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### Spin and SO groups associated to a degenerate symmetric bilinear form

aug 12 at 18:27 Qiaochu Yuan 38.4k5116303

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612
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### Classification of smooth atlases

mar 6 12 at 20:05 Ryan Budney 21.6k140101

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### Conditions for smooth dependence of the eigenvalues and eigenvectors of a matrix on a set of parameters

oct 2 at 13:03 Peter Michor 5,5421118

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681
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### Can the adjoint of the exterior derivative in semi-Riemannian geometry be defined without the Hodge * operator?

nov 29 10 at 11:17 unknown (google) 1

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### Open problems in sub-Riemannian geometry

apr 18 at 21:08 Robert Bryant 21.8k37597

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404
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### Analyticity of the solutions of PDE

apr 20 at 10:18 quid 13.3k3354

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### Applications of the natural bilinear forms on the direct sum between a vector space and its dual

feb 28 at 18:40 Peter Michor 5,5421118

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