Phase portraits of linear type centers of polynomial Hamiltonian systems with Hamiltonian function of degree 5 of the form &lt;inline-formula&gt;&lt;tex-math id="M1"&gt;\begin{document}$ H = H_1(x)+H_2(y)$\end{document}&lt;/tex-math&gt;&lt;/inline-formula&gt;
Discrete and continuous dynamical systems