I have to solve the nonlinear DE y'=x²-y² by using an infinite series expansion y=[tex]\sum_{n=0}^{\infty} a_n x^n[/tex], but I've tried in vain. Maybe a change of variables would make it easier, but I don't know which one.(adsbygoogle = window.adsbygoogle || []).push({});

Thanks

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# Nonlinear ODE by an infinite series expansion

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