Will Chen
  • Member for 10 years, 8 months
  • Last seen this week
  • New York, NY
3 answers
33 votes
5k views
23 bookmarks
What is a triangle?
1 answers
19 votes
2k views
12 bookmarks
Questions about the "universal elliptic curve" over the affine $j$-line punctured at 0 and 1728
0 answers
16 votes
482 views
4 bookmarks
Are there any examples of hyperbolic curves over finite fields such that the action of frobenius on its prime-to-$p$ fundamental group is known?
1 answers
16 votes
2k views
6 bookmarks
Why is Oka's coherence theorem a deep result?
1 answers
13 votes
1k views
6 bookmarks
Some questions about the ring Z((x))
0 answers
12 votes
260 views
8 bookmarks
Is there a geometric interpretation of the cohomology of an automorphism group acting on a universal deformation ring?
2 answers
12 votes
523 views
2 bookmarks
Automorphisms of finite order in $Out(\widehat{F_2})$
1 answers
12 votes
2k views
9 bookmarks
what exactly is the moduli functor for classifying elliptic curves with (full) level N structure?
2 answers
10 votes
236 views
For every prime divisor $p$ of a finite 2-generator group $G$, is there a generating pair containing an element of order divisible by $p$?
2 answers
10 votes
442 views
1 bookmarks
Copies of topological fundamental groups inside etale fundamental groups given by different embeddings of your field into $\mathbb{C}$
1 answers
10 votes
327 views
2 bookmarks
Can a index 2 subgroup of $\pm\Gamma(n)\le \text{SL}_2(\mathbb{Z})$ be noncongruence?
0 answers
10 votes
843 views
1 bookmarks
What is the etale fundamental group of Spec Z((x))?
1 answers
10 votes
490 views
3 bookmarks
examples of "exotic" moduli problems for elliptic curves?
1 answers
9 votes
415 views
Is Frac $\mathbb{Z}((x))$ Hilbertian?
0 answers
9 votes
208 views
do there exist finite simple characteristic quotients of the free group of rank 2?
1 answers
9 votes
383 views
1 bookmarks
Does $GL_2(\widehat{\mathbb{Z}})$ contain a dense finitely generated subgroup?
1 answers
9 votes
840 views
3 bookmarks
how do automorphisms of elliptic curves act on the Tate module?
1 answers
9 votes
564 views
2 bookmarks
what is the intersection of all congruence subgroups of the profinite completion of SL(2,Z)?
1 answers
8 votes
353 views
2 bookmarks
When is the sheaf of isomorphism classes of a reasonable moduli problem an algebraic space? a scheme?
1 answers
8 votes
536 views
2 bookmarks
what are the finite etale covers of $\mathbb{Z}_p((x))$?
0 answers
8 votes
388 views
1 bookmarks
rings of modular functions on the upper half plane
0 answers
8 votes
274 views
2 bookmarks
What is the kernel of the map $Out(\widehat{F_2})\rightarrow GL_2(\widehat{\mathbb{Z}})$?
1 answers
8 votes
1k views
5 bookmarks
why are principal GL(n)-bundles (Zariski-)locally trivial?
0 answers
8 votes
920 views
2 bookmarks
How do you get algebraic models for modular/shimura curves?
0 answers
7 votes
227 views
Possible Galois groups of residue fields of ramification points of a Galois branched cover of curves
2 answers
7 votes
332 views
2 bookmarks
Transitive actions of $Aut(F_2)$ on surjections from $F_2\twoheadrightarrow G$
1 answers
7 votes
1k views
3 bookmarks
is the modular curve X(N) defined over Q?
2 answers
7 votes
608 views
1 bookmarks
confounding riddle about fine moduli schemes and twists of elliptic curves
0 answers
7 votes
451 views
1 bookmarks
Mapping class group action on fundamental group of punctured elliptic curves
1 answers
7 votes
405 views
4 bookmarks
What is the normal closure of $GL_2(\mathbb{Z})$ inside $GL_2(\mathbb{Z}_\ell)$?