Periodic solutions of a nonlinear second order differential equation with delay |
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| Authors: | U. an der Heiden |
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| Affiliation: | Lehrstuhl für Biomathematik, Universität Tübingen, Auf der Morgenstelle 28, D-7400 Tübingen, Federal Republic of Germany |
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| Abstract: | It is proved that the autonomous difference-differential equation (0) has, for a broad class of functions f, a nonconstant periodic solution whenever the associated characteristic equation has a root with positive real part. |
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