Question

Does $\mathbb{R}/\mathbb{Q}$ contain a subgroup isomorphic to $\mathbb{Q}$?

score 547 · Answer 1 · 2026-03-27 05:55:00

547

Views

Does $\mathbb{R}/\mathbb{Q}$ contain a subgroup isomorphic to $\mathbb{Q}$?

Published on 27 Mar 2026 - 5:55

score 30 · Answer 2 · 2026-02-23 02:48:40

30

Views

Quotient of an ideal triangle in the upper half-plane by a cyclic group.

Published on 23 Feb 2026 - 2:48

score 57 · Answer 3 · 2023-12-21 11:23:28

57

Views

Is there any way to have a geometric, visual intuition of what this manifold could be?

Published on 21 Dec 2023 - 11:23

score 132 · Answer 4 · 2023-12-26 16:59:50

132

Views

Proving the image of a projection is a manifold by using the quotient manifold

Published on 26 Dec 2023 - 16:59

score 93 · Answer 5 · 2026-03-26 01:25:11

93

Views

What does the quotient space $\operatorname{SL}(n) / \sim$ look like? Is it a quotient manifold?

Published on 26 Mar 2026 - 1:25

score 33 · Answer 6 · 2024-01-06 07:43:03

33

Views

Properties of Adjunction Spaces proof from Lee's Topological Manifolds

Published on 06 Jan 2024 - 7:43

score 51 · Answer 7 · 2024-01-09 13:46:28

51

Views

Closed subspace in a quotient space.

Published on 09 Jan 2024 - 13:46

score 41 · Answer 8 · 2024-01-09 21:46:21

$X=\Bbb R \times \{-1,1\}$ , $(x,j)\sim (y,j)$ if $x=y \neq 0$, $x,y \in \Bbb R$ and $j,k \in \{-1,1\}$. $X/\sim$ with the quotient top is not T2

score 58 · Answer 9 · 2024-01-14 17:26:32

58

Views

Question regarding the proof for the universal property of a quotient space in linear algebra.

Published on 14 Jan 2024 - 17:26

score 79 · Answer 10 · 2026-03-25 13:42:12

79

Views

Factorial $+$ (at worst) quotient singularities $\implies$ smooth?

Published on 25 Mar 2026 - 13:42

score 101 · Answer 11 · 2024-01-23 17:18:17

101

Views

The norm on $\mathbb{R}^2$ is a quotient map

Published on 23 Jan 2024 - 17:18

score 42 · Answer 12 · 2024-01-25 17:03:08

42

Views

Different topologies for the real projective base as a manifold

Published on 25 Jan 2024 - 17:03

score 83 · Answer 13 · 2026-03-25 13:33:22

83

Views

Does $Spec(k[G/[P,P]])$ have worse than quotient singularities?

Published on 25 Mar 2026 - 13:33

score 55 · Answer 14 · 2026-03-25 14:29:21

55

Views

Passing an involution to a quotient algebra

Published on 25 Mar 2026 - 14:29

score 49 · Answer 15 · 2024-02-01 14:28:08

49

Views

Continuity of quotient map with respect to topology induced by metric

Published on 01 Feb 2024 - 14:28

List Question

Does $\mathbb{R}/\mathbb{Q}$ contain a subgroup isomorphic to $\mathbb{Q}$?

Quotient of an ideal triangle in the upper half-plane by a cyclic group.

Is there any way to have a geometric, visual intuition of what this manifold could be?

Proving the image of a projection is a manifold by using the quotient manifold

What does the quotient space $\operatorname{SL}(n) / \sim$ look like? Is it a quotient manifold?

Properties of Adjunction Spaces proof from Lee's Topological Manifolds

Closed subspace in a quotient space.

$X=\Bbb R \times \{-1,1\}$ , $(x,j)\sim (y,j)$ if $x=y \neq 0$, $x,y \in \Bbb R$ and $j,k \in \{-1,1\}$. $X/\sim$ with the quotient top is not T2

Question regarding the proof for the universal property of a quotient space in linear algebra.

Factorial $+$ (at worst) quotient singularities $\implies$ smooth?

The norm on $\mathbb{R}^2$ is a quotient map

Different topologies for the real projective base as a manifold

Does $Spec(k[G/[P,P]])$ have worse than quotient singularities?

Passing an involution to a quotient algebra

Continuity of quotient map with respect to topology induced by metric

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