User xiaohuamao

6 votes

1 answer

144 views

Local gauge invariance of field's homotopy class? Every map $S^2\rightarrow \mathrm{group } G$ is homotopic to a constant map?

asked Nov 11, 2013 at 11:27

5 votes

3 answers

270 views

Begin with one cell, which can die, do nothing, transform to 2 or 3 cells, with probability 1/4 respectively. How's the probability of extinction?

asked Jul 20, 2013 at 14:55

5 votes

1 answer

320 views

Why does a spiral structure appear for this function?

asked Apr 30, 2021 at 7:45

4 votes

0 answers

70 views

Is 2nd-order ODE with quadratic coefficients solvable?

asked Jan 21, 2019 at 7:24

3 votes

2 answers

201 views

What's the calculation formula of topological number for mappings of $\pi_{3}(S^2)=\mathbb{Z}$?

asked Jun 16, 2014 at 11:27

3 votes

0 answers

126 views

How to use triconfluent Heun's function?

asked Oct 6, 2020 at 7:09

3 votes

0 answers

167 views

How to analyse the smallest eigenvalue of this linear ODE?

asked Jul 14, 2019 at 7:49

2 votes

2 answers

158 views

How to solve or transform this 2nd-order linear ODE?

asked Oct 5, 2020 at 20:04

2 votes

1 answer

89 views

Schur orthogonality relation between equivalent but unequal representations?

asked Jun 1, 2022 at 2:34

2 votes

0 answers

70 views

What's the proper boundary condition for this ODE?

asked Jan 13, 2018 at 3:58

2 votes

3 answers

139 views

Constructing an odd trigonometric function with no 1st-order term in Taylor expansion

asked Feb 8, 2019 at 2:46

2 votes

1 answer

353 views

Matrix anticommuting with four or five Dirac $\Gamma$-matrices

asked Mar 25, 2019 at 6:03

2 votes

1 answer

494 views

Possible spectra of singular Sturm-Liouville problems

asked Jan 14, 2019 at 22:37

2 votes

1 answer

166 views

Is integral transform an expansion over a self-ajoint operator's eigenfunctions?

asked Mar 29, 2018 at 10:55

2 votes

0 answers

65 views

Weird eigensystem of ODE with regular singularity

asked Dec 25, 2018 at 4:46

1 vote

0 answers

37 views

Anticommuting sets of Dirac $\gamma$-matrices

asked Apr 8, 2019 at 19:55

1 vote

1 answer

195 views

Is 2nd-order linear ODE with quadratic coefficients solvable?

asked Jan 22, 2019 at 17:25

1 vote

1 answer

369 views

Is $\begin{bmatrix} 0 & A \\ B & 0 \end{bmatrix}$ similar to $\begin{bmatrix} 0 & CAC^{-1} \\ C^{-1}BC & 0 \end{bmatrix}$ by some transformation?

asked Feb 4, 2019 at 1:52

1 vote

0 answers

81 views

What's wrong with the boundary condition of this $1$st order ODE?

asked Jan 16, 2018 at 3:28

1 vote

1 answer

158 views

How to solve or transform this differential equation (to a classical form)?

asked Apr 14, 2017 at 15:21

1 vote

2 answers

70 views

Simple solution to this algebraic equation?

asked Dec 1, 2017 at 6:05

1 vote

1 answer

462 views

Is $P(\bigcup_{k=1}^\infty A_k)=\lim_{n\rightarrow\infty}P(\bigcup_{k=1}^n A_k)$ equivalent to countable additivity?

asked Dec 3, 2014 at 7:30

1 vote

1 answer

70 views

How to enclose a ball more than once with a surface homeomorphic to $S^2$? In 3D.

asked Nov 11, 2013 at 11:59

1 vote

0 answers

69 views

Is this function square-integrable? Able to be Fourier expanded?

asked Jun 8, 2014 at 3:32

1 vote

0 answers

41 views

Estimate root scale of a cubic equation

asked Jul 28, 2022 at 2:31

1 vote

0 answers

46 views

Relation between inverse square root divergence and delta-function?

asked Mar 19 at 1:53

1 vote

0 answers

48 views

Why are the two ODE solutions linearly independent?

asked Oct 11, 2020 at 0:26

1 vote

1 answer

107 views

Estimate asymptotics of an ODE

asked May 26, 2021 at 1:52

1 vote

0 answers

120 views

How to prove this trig inequality?

asked May 31, 2021 at 11:27

0 votes

1 answer

77 views

How to see this two-arm spiral structure in the vector field $\vec{V}=(x\cos{2rt}+y\sin{2rt})\begin{pmatrix} x \\ y \end{pmatrix}$?

asked Jul 2, 2021 at 23:16

Stack Exchange Network

42 Questions

Local gauge invariance of field's homotopy class? Every map $S^2\rightarrow \mathrm{group } G$ is homotopic to a constant map?

Begin with one cell, which can die, do nothing, transform to 2 or 3 cells, with probability 1/4 respectively. How's the probability of extinction?

Why does a spiral structure appear for this function?

Is 2nd-order ODE with quadratic coefficients solvable?

What's the calculation formula of topological number for mappings of $\pi_{3}(S^2)=\mathbb{Z}$?

How to use triconfluent Heun's function?

How to analyse the smallest eigenvalue of this linear ODE?

How to solve or transform this 2nd-order linear ODE?

Schur orthogonality relation between equivalent but unequal representations?

What's the proper boundary condition for this ODE?

Constructing an odd trigonometric function with no 1st-order term in Taylor expansion

Matrix anticommuting with four or five Dirac $\Gamma$-matrices

Possible spectra of singular Sturm-Liouville problems

Is integral transform an expansion over a self-ajoint operator's eigenfunctions?

Weird eigensystem of ODE with regular singularity

Anticommuting sets of Dirac $\gamma$-matrices

Is 2nd-order linear ODE with quadratic coefficients solvable?

Is $\begin{bmatrix} 0 & A \\ B & 0 \end{bmatrix}$ similar to $\begin{bmatrix} 0 & CAC^{-1} \\ C^{-1}BC & 0 \end{bmatrix}$ by some transformation?

What's wrong with the boundary condition of this $1$st order ODE?

How to solve or transform this differential equation (to a classical form)?

Simple solution to this algebraic equation?

Is $P(\bigcup_{k=1}^\infty A_k)=\lim_{n\rightarrow\infty}P(\bigcup_{k=1}^n A_k)$ equivalent to countable additivity?

How to enclose a ball more than once with a surface homeomorphic to $S^2$? In 3D.

Is this function square-integrable? Able to be Fourier expanded?

Estimate root scale of a cubic equation

Relation between inverse square root divergence and delta-function?

Why are the two ODE solutions linearly independent?

Estimate asymptotics of an ODE

How to prove this trig inequality?

How to see this two-arm spiral structure in the vector field $\vec{V}=(x\cos{2rt}+y\sin{2rt})\begin{pmatrix} x \\ y \end{pmatrix}$?