User Willie Wong

154 votes

4 answers

17k views

Does there exist a bijection of $\mathbb{R}^n$ to itself such that the forward map is connected but the inverse is not?

asked Apr 11, 2016 at 14:56

82 votes

16 answers

10k views

Tools for long-distance collaboration

asked Dec 14, 2010 at 13:11

33 votes

1 answer

5k views

What are "variational crimes" and who coined the term?

asked May 26, 2010 at 13:53

32 votes

1 answer

5k views

Jet bundles and partial differential operators

asked Sep 28, 2011 at 9:07

22 votes

1 answer

4k views

Image of the trace operator

asked Jul 19, 2011 at 14:05

17 votes

4 answers

3k views

Is Conway's base-13 function measurable?

asked Jul 20, 2010 at 14:19

17 votes

4 answers

2k views

Finite dimensional "Mountain Pass Lemma"

asked Aug 30, 2012 at 15:06

16 votes

4 answers

7k views

Commutator of Lie derivative and codifferential?

asked Feb 11, 2010 at 12:09

14 votes

1 answer

962 views

Number guessing game with lying oracle

asked Aug 17, 2018 at 4:19

12 votes

1 answer

443 views

Subtracting the weak limit reduces the norm in the limit

asked Dec 7, 2020 at 2:36

12 votes

3 answers

1k views

Is the class of n-dimensional manifolds essentially small?

asked Oct 4, 2013 at 12:07

12 votes

2 answers

851 views

The ground state is signed and symmetric

asked Feb 3, 2012 at 11:31

11 votes

1 answer

656 views

"A sea-side town where every house can see the sea"

asked Apr 23, 2011 at 1:16

9 votes

4 answers

459 views

Notion of smoothness for set-valued functions

asked Sep 8, 2010 at 14:14

9 votes

0 answers

335 views

Mappings of the sphere (to itself) defined by homogeneous polynomials

asked Mar 6 at 11:20

8 votes

1 answer

158 views

References on "not-quite" Finsler geometry?

asked Feb 10, 2021 at 15:54

8 votes

2 answers

318 views

Compressible Ebin-Marsden?

asked Dec 3, 2021 at 19:21

7 votes

2 answers

618 views

Decay of solutions to Schrodinger equation with local minimum in potential

asked Apr 1, 2015 at 13:12

7 votes

2 answers

304 views

Isometric embedding as a graph

asked Aug 20, 2013 at 20:18

7 votes

2 answers

398 views

Hypersurfaces orthogonal to a cone

asked Sep 8, 2010 at 14:45

7 votes

1 answer

744 views

Why does the triangle groups not include a tiling by 30-30-120 triangles?

asked Jun 25, 2010 at 15:20

6 votes

2 answers

451 views

Cardinality of $\eta$-bush; on a Lemma from Wolff's paper.

asked Dec 2, 2010 at 13:18

6 votes

0 answers

365 views

Whitney approximation without second countable

asked Dec 2, 2011 at 10:17

6 votes

2 answers

332 views

Maximum principle for heat equation, low regularity case

asked Oct 16, 2017 at 17:50

5 votes

1 answer

198 views

Generalisation of "tangent space" to not-necessarily connected sets

asked Jun 9, 2015 at 8:50

5 votes

2 answers

2k views

Characteristic surface for systems of PDE

asked Jul 14, 2010 at 13:06

5 votes

2 answers

877 views

Is the inclusion of Lebesgue spaces compact?

asked Oct 18, 2010 at 11:01

4 votes

1 answer

257 views

Extension by harmonics

asked Aug 2, 2018 at 4:10

4 votes

0 answers

203 views

Interpolation space of mixed Lorentz-Lebesgue spaces

asked Mar 16, 2017 at 15:17

4 votes

1 answer

265 views

Mikusiński's approach to Bochner integrals; replace absolute by unconditional?

asked May 17, 2022 at 19:56

Stack Exchange Network

37 Questions

Does there exist a bijection of $\mathbb{R}^n$ to itself such that the forward map is connected but the inverse is not?

Tools for long-distance collaboration

What are "variational crimes" and who coined the term?

Jet bundles and partial differential operators

Image of the trace operator

Is Conway's base-13 function measurable?

Finite dimensional "Mountain Pass Lemma"

Commutator of Lie derivative and codifferential?

Number guessing game with lying oracle

Subtracting the weak limit reduces the norm in the limit

Is the class of n-dimensional manifolds essentially small?

The ground state is signed and symmetric

"A sea-side town where every house can see the sea"

Notion of smoothness for set-valued functions

Mappings of the sphere (to itself) defined by homogeneous polynomials

References on "not-quite" Finsler geometry?

Compressible Ebin-Marsden?

Decay of solutions to Schrodinger equation with local minimum in potential

Isometric embedding as a graph

Hypersurfaces orthogonal to a cone

Why does the triangle groups not include a tiling by 30-30-120 triangles?

Cardinality of $\eta$-bush; on a Lemma from Wolff's paper.

Whitney approximation without second countable

Maximum principle for heat equation, low regularity case

Generalisation of "tangent space" to not-necessarily connected sets

Characteristic surface for systems of PDE

Is the inclusion of Lebesgue spaces compact?

Extension by harmonics

Interpolation space of mixed Lorentz-Lebesgue spaces

Mikusiński's approach to Bochner integrals; replace absolute by unconditional?