Centers and Isochronous Centers of Liénard Systems


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Abstract

For holomorphic Liénard equations, necessary and sufficient conditions for the existence of a center and an isochronous center are obtained without calculating the focus quantities and the isochronicity constants.

About the authors

V. V. Amel’kin

Belarusian State University

Author for correspondence.
Email: amelkin@bsu.by
Belarus, Minsk, 220030

A. E. Rudenok

Belarusian State University

Author for correspondence.
Email: roudenok@bsu.by
Belarus, Minsk, 220030

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