List questions from modular-group

Published on 23 Mar 2026 - 13:39

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Riemann surface from Linear fractional transformation

Published on 21 Feb 2020 - 4:46

85

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

Published on 13 Mar 2020 - 5:00

599

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

Published on 21 Mar 2020 - 16:02

742

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Fundamental domain for congruence subgroup.

Published on 09 Mar 2026 - 5:55

351

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

Published on 21 Mar 2026 - 16:25

128

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

Published on 07 Apr 2020 - 2:53

279

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Invertible rational matrices with positive determinant decomposition

Published on 23 Apr 2020 - 16:49

60

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

Published on 28 Apr 2020 - 1:04

257

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$N$-th root of modular forms

Published on 18 May 2020 - 17:25

519

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

Published on 24 Mar 2026 - 23:42

79

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

Published on 13 Feb 2023 - 16:07

93

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On Rudin's proof of Picard's little theorem

Published on 07 Apr 2023 - 1:41

68

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

Published on 10 Apr 2023 - 9:55

68

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Pure mapping classes

Published on 24 Mar 2026 - 17:27

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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