Justin Campbell's user avatar
Justin Campbell's user avatar
Justin Campbell's user avatar
Justin Campbell
  • Member for 14 years, 2 months
  • Last seen more than 4 years ago
67 votes
11 answers
12k views

What is significant about the half-sum of positive roots?

23 votes
5 answers
8k views

totally disconnected and zero-dimensional spaces

14 votes
2 answers
3k views

Picard group of a singular projective curve

14 votes
3 answers
2k views

Adelic description of moduli of $G$-bundles on a curve

14 votes
2 answers
1k views

Free product of categories

13 votes
4 answers
2k views

metaplectic group does not split

9 votes
2 answers
2k views

Grothendieck connections and jets

9 votes
0 answers
3k views

Definition of relative Picard functor

8 votes
1 answer
381 views

Gerbes on the multiplicative group

7 votes
1 answer
737 views

Milnor patching for schemes

7 votes
2 answers
1k views

The Lang isogeny

6 votes
1 answer
417 views

Infinitesimal equivalence of admissible representations

6 votes
1 answer
1k views

Poisson structure on the cotangent bundle

6 votes
1 answer
2k views

Semi-free resolutions

6 votes
1 answer
306 views

sheaves of modules on an $\ell$-space

4 votes
0 answers
166 views

orientations on a stratified space

4 votes
1 answer
875 views

Abelianized fundamental group of a curve over a finite field

4 votes
1 answer
1k views

Closed subgroups of a $p$-adic algebraic group

4 votes
1 answer
862 views

Heisenberg group in characteristic two

4 votes
1 answer
1k views

The rigid-analytic open disk

4 votes
1 answer
688 views

Vanishing of $\text{Ext}^2$ sheaf from abelian variety to multiplicative group

4 votes
0 answers
423 views

completion of finitely generated module over non-Noetherian ring

3 votes
3 answers
304 views

Modules for an idempotented algebra

3 votes
1 answer
795 views

Trivializing principal bundles on a curve over a finite field

3 votes
1 answer
568 views

Line bundles on a pointless curve

3 votes
2 answers
1k views

endomorphism ring of a finite-length module

3 votes
2 answers
763 views

Rees algebra for non-radical ideals

2 votes
2 answers
912 views

Lattices in algebraic geometry

2 votes
0 answers
248 views

Lang isogeny for group stacks

2 votes
0 answers
392 views

Cone of morphism between semi-free DG modules