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Existence theorem for periodic solutions of higher order nonlinear differential equations. (English) Zbl 0892.34040
The authors prove the existence of a $$T$$-periodic solution of the equation $x^{(m)}+ a_{m-1}x^{(m-1)}+ \cdots+ a_1x'+ g(t,x,x',\dots, x^{(m)})= f(t),$ where $$f(t)\equiv f(t+ T)$$. Unlike in the majority of similar papers, the nonlinearity $$g$$ depends explicitly on the highest derivative $$x^{(m)}$$.
Reviewer: J.Andres (Olomouc)

##### MSC:
 34C25 Periodic solutions to ordinary differential equations
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##### References:
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