List questions from modular-group

Published on 21 Apr 2026 - 18:35

47

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Riemann surface from Linear fractional transformation

Published on 08 Apr 2026 - 19:42

87

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

Published on 11 Apr 2026 - 3:20

602

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

Published on 27 Apr 2026 - 10:46

745

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Fundamental domain for congruence subgroup.

Published on 05 May 2026 - 20:44

354

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How do you obtain the $(2,3,7)$ triangle group as a quotient of the modular group?

Published on 04 May 2026 - 18:16

130

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How do determine if two matrices in the modular group are equivalent as elements of (2,3,7)

Published on 16 Apr 2026 - 2:55

280

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Invertible rational matrices with positive determinant decomposition

Published on 25 Mar 2026 - 6:10

61

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Solve the matrix equation $\varphi(B)=B$

Published on 25 Mar 2026 - 6:09

260

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$N$-th root of modular forms

Published on 11 Apr 2026 - 2:24

534

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Finite index subgroups of $SL(2,\mathbb Z)$

Published on 25 Apr 2026 - 8:30

80

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Unique factorization of elements in $SL_2(\mathbb{Z})$

Published on 25 Mar 2026 - 6:09

94

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On Rudin's proof of Picard's little theorem

Published on 25 Mar 2026 - 6:12

69

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Modular invariant partition function of 2d CFT tours = Virasoro characters?

Published on 25 Mar 2026 - 6:11

85

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Pure mapping classes

Published on 03 May 2026 - 9:48

List Question

Cyclic subgroup of finite index in $\text{PSL}_2(\mathbb{Z})$

Riemann surface from Linear fractional transformation

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

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

Fundamental domain for congruence subgroup.

How do you obtain the $(2,3,7)$ triangle group as a quotient of the modular group?

How do determine if two matrices in the modular group are equivalent as elements of (2,3,7)

Invertible rational matrices with positive determinant decomposition

Solve the matrix equation $\varphi(B)=B$

$N$-th root of modular forms

Finite index subgroups of $SL(2,\mathbb Z)$

Unique factorization of elements in $SL_2(\mathbb{Z})$

On Rudin's proof of Picard's little theorem

Modular invariant partition function of 2d CFT tours = Virasoro characters?

Pure mapping classes

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