We investigate the existence of multiple positive solutions for a class of first-order periodic boundary value problems. The proof of the main results is based on the theories of upper and lower solutions and Leray-Schauder degree.
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Cite this article as: WU Meng-Li. Existence of multiple positive solutions for a class of first-order periodic boundary value problems [J]. J Sichuan Univ: Nat Sci Ed, 2022, 59: 011004.