User xiaohuamao

xiaohuamao

Member for 8 years, 11 months
Last seen more than a week ago

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Oct 7, 2020

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Oct 13, 2015
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Nov 16
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Dec 4, 2014

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trigonometry

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algebra-precalculus

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functions

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ordinary-differential-equations

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eigenvalues-eigenvectors

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

Nov 11, 2013

Why does a spiral structure appear for this function?

Apr 30, 2021

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?

Jul 20, 2013

Is 2nd-order ODE with quadratic coefficients solvable?

Jan 21, 2019

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

Jun 16, 2014

How to use triconfluent Heun's function?

Oct 6, 2020

How to analyse the smallest eigenvalue of this linear ODE?

Jul 14, 2019

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

Oct 5, 2020

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

Feb 8, 2019

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

Mar 25, 2019

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