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# Questions

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### When singular points of a reduced scheme are not dense in it?

jun 1 10 at 20:31 Qing Liu 8,5851726

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### Morphisms between pure complexes of sheaves

may 2 10 at 13:52 Geordie Williamson 1,237410

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### A silly question: is the number of points on a Jacobian (of a curve, over a finite field) known?

nov 11 10 at 11:36 Francesco Polizzi 18.8k23455

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### Questions on standard (motivic) conjectures

jan 16 11 at 18:32 mephisto 16613

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### If $X,Y$ are regular and of finite type over $S$, can $X\times _S Y$ be embedded into a regular $S$-scheme?

feb 21 at 21:29 Mikhail Bondarko 5,8761421

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### A canonical way to kill a subset of cohomology in a dg-algebra: via $A_\infty$-algebras? References?

jan 28 at 6:57 Mikhail Bondarko 5,8761421

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### Should the etale cohomology of a smooth projective variety (over rationals) be semi-simple; why?

feb 27 at 15:16 Daniel Miller 2,311823

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### Which schemes can be presented as limits of smooth varieties?

mar 6 at 10:06 Mikhail Bondarko 5,8761421

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### (Co)homological characterization of homotopy pullbacks

feb 28 12 at 23:45 John Klein 7,1031928

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