List questions from modular-group

Published on 21 Mar 2026 - 21:14

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Why is this discrete subgroup of $PSL(2,\mathbb{C})$ not Kleinian?

Published on 19 Mar 2026 - 14:55

389

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When $J(\tau)\in\mathbb{R}$? ($J$ is Klein's $j$-invariant.)

Published on 19 Mar 2026 - 6:44

736

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Does every subgroup of finite index contain a power of each element of the group?

Published on 21 Mar 2026 - 1:20

897

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Free subgroups of $PSL(2,\mathbb{Z})$ of index 6

Published on 19 Mar 2026 - 15:26

107

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Tangent bundle on modular surface

Published on 19 Mar 2026 - 15:45

81

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To prove that the Elliptic modular function is invariant under the modular transformation

Published on 19 Mar 2026 - 13:41

699

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Center of $\pi_{1}(\mathbb{R}^{3} \backslash \text{trefoil knot})$ and $\mathrm{PSL}_{2}(\mathbb{Z})$

Published on 19 Mar 2026 - 12:54

52

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If $G$ is a group acting on a set $H$, what does it mean for two elements of set $H$ to be "congruent modulo $G$"?

Published on 21 Mar 2026 - 17:55

126

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why is $\Gamma(1)\setminus H$ a 2-sphere with one point missing?

Published on 19 Mar 2026 - 7:46

860

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The commutator subgroup of modular group is a free group of rank 2

Published on 19 Mar 2026 - 6:56

319

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Decomposition of modular group elements

Published on 19 Mar 2026 - 13:05

116

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About the order of element in $GL_2(\mathbb{Z})$

Published on 22 Mar 2026 - 6:09

209

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Index of a subgroup of the Modular Group

Published on 23 Mar 2026 - 14:59

284

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Doubts in proof of a theorem related to modular functions from Tom Apostol 's Modular functions and Dirichlet series in Number Theory

Published on 22 Mar 2026 - 9:10

List Question

modular group, prime ideals

Why is this discrete subgroup of $PSL(2,\mathbb{C})$ not Kleinian?

When $J(\tau)\in\mathbb{R}$? ($J$ is Klein's $j$-invariant.)

Does every subgroup of finite index contain a power of each element of the group?

Free subgroups of $PSL(2,\mathbb{Z})$ of index 6

Tangent bundle on modular surface

To prove that the Elliptic modular function is invariant under the modular transformation

Center of $\pi_{1}(\mathbb{R}^{3} \backslash \text{trefoil knot})$ and $\mathrm{PSL}_{2}(\mathbb{Z})$

If $G$ is a group acting on a set $H$, what does it mean for two elements of set $H$ to be "congruent modulo $G$"?

why is $\Gamma(1)\setminus H$ a 2-sphere with one point missing?

The commutator subgroup of modular group is a free group of rank 2

Decomposition of modular group elements

About the order of element in $GL_2(\mathbb{Z})$

Index of a subgroup of the Modular Group

Doubts in proof of a theorem related to modular functions from Tom Apostol 's Modular functions and Dirichlet series in Number Theory

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