(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Hi, i have the following system of equation. In the task is that system have periodic solution and have to be used polar coordinates.

2. Relevant equations

x'=1+y-x^2-y^2

y'=1-x-x^2-y^2

3. The attempt at a solution

After transfer to polar system i tried to use the method of variation of parameters, but without success.

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# Homework Help: System of nonlinear PDE

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