64

Questions

6
11
votes
5
answers
2k
views

Can a quotient ring R/J ever be flat over R?

nov 13 09 at 0:42 Mark Hovey 1,950413

5
11
votes
2
answers
719
views

What is the universal property of associated graded?

oct 12 09 at 4:36 Anton Geraschenko♦♦ 13.7k348108

7
11
votes
5
answers
938
views

What are the most important instances of the “yoga of generic points”?

nov 17 10 at 6:38 roy smith 4,8713428

6
11
votes
4
answers
659
views

Does every morphism BG-->BH come from a homomorphism G-->H?

oct 28 09 at 5:09 Anton Geraschenko♦♦ 13.7k348108

4
11
votes
4
answers
741
views

Does smoothness descend along flat morphisms?

aug 31 at 21:08 Qing Liu 8,5851726

3
11
votes
3
answers
913
views

Is there an additive functor between abelian categories which isn’t exact in the middle?

nov 15 10 at 4:37 Anton Geraschenko♦♦ 13.7k348108

2
10
votes
0
answers
249
views

Can a single DVR witness all specializations on a variety?

oct 26 10 at 0:41 Anton Geraschenko♦♦ 13.7k348108

4
10
votes
2
answers
548
views

Is an affine “G-variety” with reductive stabilizers a toric variety?

apr 19 11 at 0:45 Anton Geraschenko♦♦ 13.7k348108

3
10
votes
2
answers
238
views

Do orbits and stable loci of group actions have natural scheme structures?

oct 29 09 at 2:35 S. Carnahan 25.6k4190

5
9
votes
2
answers
687
views

Is the fixed locus of a group action always a scheme?

feb 10 10 at 17:42 Anton Geraschenko♦♦ 13.7k348108

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