Abstract
In this paper, we study positive periodic solutions to singular second order differential systems. It is proved that such a problem has at least two positive periodic solutions. The proof relies on a nonlinear alternative of Leray-Schauder type and on Krasnosel'skiĭ fixed point theorem on compression and expansion of cones.
Citation
Xiaoning Lin. Daqing Jiang. Donal O'Regan. Ravi P. Agarwal. "Twin positive periodic solutions of second order singular differential systems." Topol. Methods Nonlinear Anal. 25 (2) 263 - 273, 2005.
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