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Autor:
Abdallah Brik, Amel Boulfoul
Publikováno v:
Boletim da Sociedade Paranaense de Matemática, Vol 42 (2024)
In this paper, we study the limit cycles of a perturbed differential in $\mathbb{R} ^2$, given by \begin{equation*} \left\{ \begin{array}{ccl} \overset{.}{x} &=& y ,\\ \overset{.}{y} &=& -x-\epsilon (1+\sin^n (\theta) \cos^m (\theta))H(x,y), \
Externí odkaz:
https://doaj.org/article/37419d6ba70f452cbda8754e0cebf4fc
