J. Nonl. Mod. Anal., 4 (2022), pp. 488-501.
Published online: 2022-06
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In this paper, we give all the first integrals of the quintic systems which have a uniform isochronous center, and use them to determine the qualitative behavior of the periodic solutions of their equivalent non-autonomous systems. Meanwhile, we clearly describe the local phase portraits of singularity at infinity.
}, issn = {2562-2862}, doi = {https://doi.org/10.12150/jnma.2022.488}, url = {http://global-sci.org/intro/article_detail/jnma/20720.html} }In this paper, we give all the first integrals of the quintic systems which have a uniform isochronous center, and use them to determine the qualitative behavior of the periodic solutions of their equivalent non-autonomous systems. Meanwhile, we clearly describe the local phase portraits of singularity at infinity.