A criterion for the existence of four li
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G.A. Leonov
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Article
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2010
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Elsevier Science
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English
β 311 KB
A method for the asymptotic integration of the trajectories is proposed for the LiΓ©nard equation. The results obtained by this method are used to prove the existence of two "large" limit cycles in quadratic systems with a weak focus. The application of standard procedures of small perturbations of t