Upper and lower solutions for periodic problems. (English) Zbl 1090.34552

Summary: Upper and lower solutions method, topological degree and Miranda fixed-point theorem are applied to obtain the existence of at least one periodic solution for second-order and first-order nonlinear differential systems.


34C25 Periodic solutions to ordinary differential equations
34B15 Nonlinear boundary value problems for ordinary differential equations
Full Text: DOI


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