On Chouikha's isochronicity criterion
classification
🧮 math.CA
keywords
characterizationchouikhaisochronicitysomeanothercentercriteriondefined
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Recently A.R.Chouikha gave a new characterization of isochronicity of center at the origin for the equation $x"+g(x)=0$, where $g$ is a real smooth function defined in some neighborhood of $0 \in \R$. We describe another proof of his characterization and some new development of the subject.
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