Isochronicity conditions for some planar polynomial systems II

Details Isochronicity conditions for some planar polynomial systems II Isochronicity conditions for some planar polynomial systems II

2010-05-27

arxiv.org/abs/1005.5048v4

Mathematics

Classical Analysis and ODEs

Scientific paper

We study the isochronicity of centers at $O\in \mathbb{R}^2$ for systems $$\dot x=-y+A(x,y),\;\dot y=x+B(x,y),$$ where $A,\;B\in \mathbb{R}[x,y]$, which can be reduced to the Li\'enard type equation. When $deg(A)\leq 4$ and $deg(B) \leq 4$, using the so-called C-algorithm we found $36$ new families of isochronous centers. When the Urabe function $h=0$ we provide an explicit general formula for linearization. This paper is a direct continuation of \cite{BoussaadaChouikhaStrelcyn2010} but can be read independantly.

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