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# Questions

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### Counterexamples in Algebra?

aug 8 11 at 17:49 Chandrasekhar 2,06011128

36
89
15
7k
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### When and how is it appropriate for an undergraduate to email a professor out of the blue?

aug 31 11 at 17:19 Gil Kalai 11.1k681146

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10
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### Spectral sequences: opening the black box slowly with an example

dec 15 10 at 10:14 Matthias Künzer 50347

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-2
4
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jul 17 10 at 11:07 Mark Schwarzmann 2,19211427

6
16
3
1k
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### Prime ideals in the ring of germs of continuous functions

nov 30 11 at 13:18 Georges Elencwajg 24.6k66132

4
8
6
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### Is the dual notion of a presheaf useful?

jul 18 10 at 13:19 G. Rodrigues 1,01548

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13
3
1k
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### Cobordism categories that don’t involve manifolds

mar 29 11 at 15:19 Todd Trimble 22.7k16497

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6
3
983
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### A toy example of a tensor triangulated category?

apr 19 11 at 5:27 Mikhail Bondarko 5,9261421

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14
3
973
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### Proof that the homotopy category of a stable $\infty$-category is triangulated

feb 14 11 at 17:37 Harry Gindi 8,94823397

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