Will Chen's user avatar
Will Chen's user avatar
Will Chen's user avatar
Will Chen
  • Member for 12 years, 10 months
  • Last seen this week
  • New York, NY
32 votes
Accepted

The difference between an étale finite group scheme and a finite group

27 votes

Results from abstract algebra which look wrong (but are true)

16 votes

What is the arithmetic fundamental group?

15 votes

Is Proposition 2.6 in J. Silverman's book Arithmetic of Elliptic Curves correct?

13 votes
Accepted

do there exist finite simple characteristic quotients of the free group of rank 2?

11 votes
Accepted

Is $\mathscr{M}_{1,1,\mathbb{Z}}$ isomorphic to a quotient stack by a finite group?

10 votes
Accepted

Is every smooth projective curve a modular curve?

10 votes

Are relative curves $X \to S$ determined by their fibers?

10 votes

The Origin(s) of Modular and Moduli

10 votes

Are "large enough" finite etale covers arithmetic?

8 votes
Accepted

Map Lifting lemma and Etale fundamental group

8 votes
Accepted

Universal elliptic curve and the Tate curve

7 votes
Accepted

Why is the inertia stack of a smooth Deligne-Mumford stacks called inertia?

7 votes

Vector bundles vs principal $G$-bundles

6 votes
Accepted

Is the number of ramified coverings of given degree of a curve with prescribed branch divisor finite?

6 votes

Is the action of $\textrm{Gal}(\overline{k}/k)$ on $G \times_k \overline{k}$ a group homomorphism?

6 votes

Is every $GL_2(\mathbb{Z}/n\mathbb{Z})$-extension contained in some elliptic curve's torsion field?

6 votes
Accepted

Is $\widehat{\mathbb{Z}}[[t]]\cong\widehat{\mathbb{Z}}[[\widehat{\mathbb{Z}}]]$?

5 votes
Accepted

Correspondence between coverings and field extensions

5 votes

technical question about a paper on Belyi's theorem

5 votes
Accepted

Character variety of the free group

5 votes

When is $X_0(N)$ representable?

5 votes

When is a morphism of smooth schemes over a strictly henselian base etale

4 votes

Congruence Subgroups as Open Subgroups of the Modular Group Under the Right Topology

4 votes

What elementary problems can you solve with schemes?

4 votes
Accepted

Geometric interpretation of sections $H^0(\Theta_X, X)$ of the Tangent sheaf over curve

4 votes

Rational points on towers of curves

4 votes

Section of universal curve

3 votes

Is it meaningful to work on convergencies, integration, etc. on the Zariski topology?

3 votes
Accepted

Any galois covering of $P^{1}$ over rationals are of the form $\mathbb{P}^1_L\to\mathbb{P}^1_\mathbb{Q}$