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# Questions

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### What do coherent topoi have to do with completeness?

2d ago StephenK1 1

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### Two questions on rational homotopy theory

oct 27 11 at 22:11 Hiro Lee Tanaka 1,373714

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### What kinds of sets can replace lattices in the Shannon sampling theorem?

may 30 10 at 2:35 AgCl 1,0181121

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### What is a simplicial commutative ring from the point of view of homotopy theory?

jan 11 at 21:42 André Henriques 14.8k23083

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### Fundamental group of the moduli stack of elliptic curves

aug 24 at 21:19 quasi-coherent 49436

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### Why do Clifford algebras determine $KO$ (and $K$-)-theory?

jan 12 12 at 23:22 Johannes Ebert 11.4k3355

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### A homotopy commutative diagram that cannot be strictified

dec 30 11 at 4:03 Dan Ramras 3,73121626

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### Are there complexity classes with provably no complete problems?

sep 26 10 at 2:56 kos 111

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### What do cohomology operations have to do with the non-existence of commutative cochains over $\mathbb{Z}$?

sep 21 at 12:26 Justin Young 1633

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