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# Questions

2
6
votes
2
answers
352
views

### Does there exist a functorial splitting for the weight filtration (of singular cohomology)?

apr 23 at 1:42 David Speyer 55.4k3102237

2
12
votes
1
answer
439
views

### What is the purpose of section 3 of BBD?

apr 12 at 2:12 S. Carnahan 25.6k4190

1
vote
1
answer
140
views

### How would you say that a small category is embedded into functors from a large $C'$ to abelian groups?

apr 8 at 5:00 Mikhail Bondarko 5,8761421

1
3
votes
0
answers
72
views

### Singularity locus in terms of ideals.

apr 6 at 6:41 Mikhail Bondarko 5,8761421

3
votes
0
answers
316
views

### When $R/(f)$ is regular?

mar 25 at 11:43 Mikhail Bondarko 5,8761421

1
2
votes
0
answers
101
views

### Regular subscheme of a projective limit of schemes

mar 11 at 8:42 Mikhail Bondarko 5,8761421

2
4
votes
1
answer
177
views

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

mar 6 at 10:06 Mikhail Bondarko 5,8761421

4
votes
1
answer
420
views

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

feb 27 at 15:16 Daniel Miller 2,311823

0
votes
0
answers
116
views

### How would you call a subscheme of a smooth $S$-scheme?

feb 23 at 8:35 Mikhail Bondarko 5,8761421

1
4
votes
0
answers
110
views

### 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