TY - JOUR T1 - Existence of Periodic Solutions of a Class of Second-Order Non-Autonomous Systems AU - Qi , Yuan AU - Liu , Kun JO - Annals of Applied Mathematics VL - 1 SP - 30 EP - 35 PY - 2022 DA - 2022/06 SN - 32 DO - http://doi.org/ UR - https://global-sci.org/intro/article_detail/aam/20625.html KW - second-order non-autonomous systems, periodic solutions, Schauder’s fixed point theorem, Miranda’s theorem. AB -

In this paper, we are concerned with the existence of periodic solutions of second-order non-autonomous systems. By applying the Schauder’s fixed point theorem and Miranda’s theorem, a new existence result of periodic solutions is established.