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# Questions

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### What is an algebraic group over a noncommutative ring?

mar 8 10 at 16:47 Pete L. Clark 39.6k3102225

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### If the second derivative of a function on $\mathbb R^n$ is everywhere nondegenerate, does it follow that the first derivative is an injection?

apr 3 10 at 10:16 Thomas Kragh 1,360412

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### What is known about higher-categorical reconstruction theorems? (reference request)

aug 9 10 at 19:43 André Henriques 14.9k23083

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### An explicit description of $\operatorname{gr}(k \cdot G)$ for the filtration induced by the augmentation ideal?

feb 18 11 at 17:17 Andreas Thom 13.1k12364

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### How complicated is infinite-dimensional “undergraduate linear algebra”?

oct 25 10 at 17:22 Greg Kuperberg 36.3k2116179

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### Is the pairing between contours and functions perfect (modulo the kernel given by Stokes' theorem)?

mar 7 12 at 1:11 Tom Goodwillie 26.7k258110

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### What functor is adjoint to the tensor product of 2-vector spaces?

apr 14 10 at 21:20 Reid Barton 14.4k12885

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### Which functions are Wiener-integrable?

feb 26 10 at 3:31 userN 2,674924

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### Which is the correct universal enveloping algebra in positive characteristic?

jun 26 10 at 23:45 Chris 3517

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