Question

Principal congruence subgroup $\Gamma(DN)$ and $\Gamma(N)$

score 173 · Answer 1 · 2026-04-14 00:17:12

173

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Principal congruence subgroup $\Gamma(DN)$ and $\Gamma(N)$

Published on 14 Apr 2026 - 0:17

score 83 · Answer 2 · 2026-05-11 01:48:55

83

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Meromorphic functions on upper half plane and infinity

Published on 11 May 2026 - 1:48

score 130 · Answer 3 · 2026-04-15 09:40:16

130

Views

Let $\frac{r}{2t}\in\mathbb{Q}$ with $r,t$ odd, then $\frac{r}{2t}\in\Gamma_1(4)*\frac{1}{2}$ with $\Gamma_1(4)$ a principal subgroup.

Published on 15 Apr 2026 - 9:40

score 54 · Answer 4 · 2026-05-10 17:15:29

54

Views

Allowed ramification of deformations of Galois representations

Published on 10 May 2026 - 17:15

score 88 · Answer 5 · 2026-05-13 16:40:00

88

Views

Definition of congruence subgroup $\Gamma_0(N)$ when $N$ is negative

Published on 13 May 2026 - 16:40

score 833 · Answer 6 · 2026-04-13 00:03:29

833

Views

Why are the Fourier coefficients of a modular form constant?

Published on 13 Apr 2026 - 0:03

score 542 · Answer 7 · 2026-04-14 13:56:57

542

Views

Computing the width of a cusp of a congruence subgroup of level $N$ "in characteristic $N$".

Published on 14 Apr 2026 - 13:56

score 179 · Answer 8 · 2026-05-02 02:27:51

179

Views

Do all cuspidal automorphic representations of $\operatorname{GL}_2(\mathbb A_{\mathbb Q})$ come from Maass or holomorphic cusp forms?

Published on 02 May 2026 - 2:27

score 602 · Answer 9 · 2026-04-27 10:46:59

602

Views

$SL(2, \Bbb Z)$ has only one cusp

Published on 27 Apr 2026 - 10:46

score 184 · Answer 10 · 2026-05-11 00:48:20

184

Views

Proof of Meromorphicity of Eisenstein Series in Serre's 'A Course in Arithmetic'

Published on 11 May 2026 - 0:48

score 26 · Answer 11 · 2026-04-16 13:56:44

26

Views

Identifying Modular Functions of Weight $2k$ with Lattice Functions of Weight $2k$

Published on 16 Apr 2026 - 13:56

score 125 · Answer 12 · 2026-04-12 15:42:48

125

Views

Order of a Modular Function at a Point is Invariant under $SL_2(\mathbb{Z})$ Action: Interpretation and Proof

Published on 12 Apr 2026 - 15:42

score 745 · Answer 13 · 2026-05-05 20:44:47

745

Views

Fundamental domain for congruence subgroup.

Published on 05 May 2026 - 20:44

score 101 · Answer 14 · 2026-04-17 15:00:41

101

Views

Various variants of modular forms

Published on 17 Apr 2026 - 15:00

score 204 · Answer 15 · 2026-05-03 15:35:53

204

Views

Modularity in terms of the stack of elliptic curves

Published on 03 May 2026 - 15:35

List Question

Principal congruence subgroup $\Gamma(DN)$ and $\Gamma(N)$

Meromorphic functions on upper half plane and infinity

Let $\frac{r}{2t}\in\mathbb{Q}$ with $r,t$ odd, then $\frac{r}{2t}\in\Gamma_1(4)*\frac{1}{2}$ with $\Gamma_1(4)$ a principal subgroup.

Allowed ramification of deformations of Galois representations

Definition of congruence subgroup $\Gamma_0(N)$ when $N$ is negative

Why are the Fourier coefficients of a modular form constant?

Computing the width of a cusp of a congruence subgroup of level $N$ "in characteristic $N$".

Do all cuspidal automorphic representations of $\operatorname{GL}_2(\mathbb A_{\mathbb Q})$ come from Maass or holomorphic cusp forms?

$SL(2, \Bbb Z)$ has only one cusp

Proof of Meromorphicity of Eisenstein Series in Serre's 'A Course in Arithmetic'

Identifying Modular Functions of Weight $2k$ with Lattice Functions of Weight $2k$

Order of a Modular Function at a Point is Invariant under $SL_2(\mathbb{Z})$ Action: Interpretation and Proof

Fundamental domain for congruence subgroup.

Various variants of modular forms

Modularity in terms of the stack of elliptic curves

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