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# Existence of Periodic Solutions of Second Order Differential Equations with Delay

Gerhard Metzen
Proceedings of the American Mathematical Society
Vol. 103, No. 3 (Jul., 1988), pp. 765-772
DOI: 10.2307/2046850
Stable URL: http://www.jstor.org/stable/2046850
Page Count: 8
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## Abstract

We prove the existence of $2\pi$-periodic solutions of second order ordinary differential equations with delay. In particular we study the effect the delay has with respect to the solvability of such problems. Resonance and nonresonance problems are considered.

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