Well-Ordered and Non-Well-Ordered Lower and Upper Solutions for Periodic Planar Systems
نویسندگان
چکیده
Abstract The aim of this paper is to extend the theory lower and upper solutions periodic problem associated with planar systems differential equations. We generalize previously given definitions we are able treat both well-ordered case non-well-ordered case. proofs involve topological degree arguments, together a detailed analysis in phase plane.
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ژورنال
عنوان ژورنال: Advanced Nonlinear Studies
سال: 2021
ISSN: ['1536-1365', '2169-0375']
DOI: https://doi.org/10.1515/ans-2021-2117