xiaohuamao

Member for 10 years, 4 months
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algebra-precalculus

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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

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

Why does a spiral structure appear for this function?

Apr 30, 2021

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

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How to find roots of $f(z)=(a+yg(z))^2+g(z)^2=0$?

Oct 13, 2015

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

Feb 9, 2019

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

Apr 7, 2019

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