Question

For a continuous group action, is the projection $\pi:M\to M/G$ into the orbit space an open map?

score 868 · Answer 1 · 2018-08-21 05:41:57

868

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For a continuous group action, is the projection $\pi:M\to M/G$ into the orbit space an open map?

Published on 21 Aug 2018 - 5:41

score 1k · Answer 2 · 2026-03-26 04:53:23

1k

Views

Proof of Uniqueness of $q$ and $r$ in Quotient and Remainder Theorem

Published on 26 Mar 2026 - 4:53

score 2.8k · Answer 3 · 2018-08-22 02:09:31

2.8k

Views

Doubt with proof of if $G$ is simple and $\delta\geq\frac{n-1}2$, then $G$ is connected

Published on 22 Aug 2018 - 2:09

score 2.2k · Answer 4 · 2026-03-25 19:04:27

2.2k

Views

Understanding a proof that the topologist's sine curve is not path connected.

Published on 25 Mar 2026 - 19:04

score 402 · Answer 5 · 2018-08-22 06:10:39

402

Views

Proof of an equivalent criterion for continuous functions in topological spaces

Published on 22 Aug 2018 - 6:10

score 44 · Answer 6 · 2018-08-22 07:14:03

44

Views

A function $ f : [0,1] \to \Bbb{C} $ is differentiable with derivative 0, is constant.

Published on 22 Aug 2018 - 7:14

score 801 · Answer 7 · 2026-03-25 10:22:00

801

Views

Proof for Liouville's theorem - Hamiltonian mechanics

Published on 25 Mar 2026 - 10:22

score 67 · Answer 8 · 2026-03-27 15:55:12

67

Views

The Lie Algebra and Tangent Space proof in Brain Hall

Published on 27 Mar 2026 - 15:55

score 6k · Answer 9 · 2026-03-28 02:21:27

6k

Views

Proof by Induction involving Two Variables

Published on 28 Mar 2026 - 2:21

score 107 · Answer 10 · 2018-08-23 06:26:17

107

Views

Proof explanation $|x| - |y| \le |x - y|$ (Spivak's Calculus Book)

Published on 23 Aug 2018 - 6:26

score 127 · Answer 11 · 2026-03-25 12:46:41

127

Views

How to find the $\pi$?

Published on 25 Mar 2026 - 12:46

score 1.1k · Answer 12 · 2026-03-31 09:24:08

1.1k

Views

Proof of primitive element theorem in Lang's Algebra

Published on 31 Mar 2026 - 9:24

score 369 · Answer 13 · 2026-03-27 08:42:04

369

Views

Witt dimension formula for free Lie Algebras

Published on 27 Mar 2026 - 8:42

score 540 · Answer 14 · 2026-03-25 21:47:49

540

Views

Immersion Etale if and only if Open Immersion

Published on 25 Mar 2026 - 21:47

score 51 · Answer 15 · 2026-03-25 23:39:26

51

Views

Using $\epsilon-\delta$-definition to prove the sign of $f$

Published on 25 Mar 2026 - 23:39

List Question

For a continuous group action, is the projection $\pi:M\to M/G$ into the orbit space an open map?

Proof of Uniqueness of $q$ and $r$ in Quotient and Remainder Theorem

Doubt with proof of if $G$ is simple and $\delta\geq\frac{n-1}2$, then $G$ is connected

Understanding a proof that the topologist's sine curve is not path connected.

Proof of an equivalent criterion for continuous functions in topological spaces

A function $ f : [0,1] \to \Bbb{C} $ is differentiable with derivative 0, is constant.

Proof for Liouville's theorem - Hamiltonian mechanics

The Lie Algebra and Tangent Space proof in Brain Hall

Proof by Induction involving Two Variables

Proof explanation $|x| - |y| \le |x - y|$ (Spivak's Calculus Book)

How to find the $\pi$?

Proof of primitive element theorem in Lang's Algebra

Witt dimension formula for free Lie Algebras

Immersion Etale if and only if Open Immersion

Using $\epsilon-\delta$-definition to prove the sign of $f$

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