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Will Chen
  • Member for 11 years
  • Last seen this week
  • New York, NY
30 votes
Accepted

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

15 votes

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

14 votes

What is the arithmetic fundamental group?

11 votes
Accepted

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

10 votes

The Origin(s) of Modular and Moduli

10 votes

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

9 votes

Are "large enough" finite etale covers arithmetic?

8 votes
Accepted

Map Lifting lemma and Etale fundamental group

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

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

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?

5 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 a morphism of smooth schemes over a strictly henselian base etale

5 votes

When is $X_0(N)$ representable?

4 votes

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

4 votes

Rational points on towers of curves

4 votes

Section of universal curve

3 votes
Accepted

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

3 votes

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

3 votes
Accepted

Reference for the proof of this lemma. "Double group trick"

3 votes

Classification of first order deformations of n-pointed non-singular variety

3 votes

What elementary problems can you solve with schemes?

3 votes

Smooth Models of Hyperelliptic Curves (+ a concrete question)

3 votes
Accepted

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

3 votes

Field of definition/moduli through the monodromy