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Non-existence of periodic solutions of the Liénard system. (English) Zbl 0731.34042
For the Liénard system $$x'=y-F(x)$$, $$y'=-g(x)$$ some sufficient conditions on F and g are given, under which the system has nonconstant periodic solution.
Reviewer: I.Ginchev (Varna)

##### MSC:
 34C25 Periodic solutions to ordinary differential equations 34C05 Topological structure of integral curves, singular points, limit cycles of ordinary differential equations
##### Keywords:
Liénard system; periodic solution
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##### References:
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