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xiaohuamao
  • Member for 10 years, 7 months
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6 votes
1 answer
146 views

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

5 votes
3 answers
283 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?

5 votes
1 answer
330 views

Why does a spiral structure appear for this function?

4 votes
0 answers
70 views

Is 2nd-order ODE with quadratic coefficients solvable?

3 votes
2 answers
210 views

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

3 votes
0 answers
131 views

How to use triconfluent Heun's function?

3 votes
0 answers
174 views

How to analyse the smallest eigenvalue of this linear ODE?

2 votes
1 answer
107 views

Schur orthogonality relation between equivalent but unequal representations?

2 votes
0 answers
70 views

What's the proper boundary condition for this ODE?

2 votes
3 answers
139 views

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

2 votes
1 answer
369 views

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

2 votes
1 answer
525 views

Possible spectra of singular Sturm-Liouville problems

2 votes
1 answer
172 views

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

2 votes
0 answers
65 views

Weird eigensystem of ODE with regular singularity

2 votes
2 answers
161 views

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

1 vote
0 answers
38 views

Anticommuting sets of Dirac $\gamma$-matrices

1 vote
1 answer
196 views

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

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?

1 vote
0 answers
81 views

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

1 vote
1 answer
163 views

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

1 vote
2 answers
71 views

Simple solution to this algebraic equation?

1 vote
1 answer
498 views

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

1 vote
1 answer
70 views

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

1 vote
0 answers
69 views

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

1 vote
0 answers
41 views

Estimate root scale of a cubic equation

1 vote
0 answers
50 views

Relation between inverse square root divergence and delta-function?

1 vote
0 answers
49 views

Why are the two ODE solutions linearly independent?

1 vote
1 answer
117 views

Estimate asymptotics of an ODE

1 vote
0 answers
120 views

How to prove this trig inequality?

0 votes
1 answer
84 views

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