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Zbl 1127.34023
Chu, Jifeng; Torres, Pedro J.; Zhang, Meirong
Periodic solutions of second order non-autonomous singular dynamical systems. (English)
[J] J. Differ. Equations 239, No. 1, 196-212 (2007). ISSN 0022-0396

The authors use topological methods to prove the existence of positive solutions for some non-autonomous singular second order systems. These are solutions whose components all take only positive values. The singularity can be either of strong or of weak type.
[Alessandro Fonda (Trieste)]
MSC 2000:
*34C25 Periodic solutions of ODE
34B15 Nonlinear boundary value problems of ODE
47H10 Fixed point theorems for nonlinear operators on topol.linear spaces

Keywords: strong and weak singularity

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