List questions from modular-group

Published on 10 May 2026 - 9:21

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

Published on 05 May 2026 - 8:24

404

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

Published on 05 May 2026 - 12:52

757

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

Published on 05 May 2026 - 9:46

909

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

Published on 04 May 2026 - 23:26

117

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Tangent bundle on modular surface

Published on 05 May 2026 - 6:37

90

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

Published on 04 May 2026 - 21:34

708

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

Published on 04 May 2026 - 21:10

61

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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 07 May 2026 - 8:10

135

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

Published on 04 May 2026 - 23:40

866

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

Published on 03 May 2026 - 20:38

328

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Decomposition of modular group elements

Published on 03 May 2026 - 23:53

124

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

Published on 06 May 2026 - 18:14

235

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Index of a subgroup of the Modular Group

Published on 03 May 2026 - 7:46

290

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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 06 May 2026 - 16:18

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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