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On a second order periodic boundary value problem. (English) Zbl 0715.34036
Summary: We consider a nonlinear differential equation of second order which has been proposed as a model for the periodic motion of a satellite in its elliptical orbit. We use some elementary methods to demonstrate the existence of an odd periodic solution for a considerably larger parameter set than considered earlier.

MSC:
34B15 Nonlinear boundary value problems for ordinary differential equations
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