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In this article, we investigate the existence of periodic solutions for a class of nonautonomous second-order differential systems with p(t)-Laplacian. Some multiplicity results are obtained by using critical point theory, which extend some known results. 相似文献
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利用重合度理论中的Mawhin延拓定理,研究一类具Beddington -DeAngelis功能反应和收获项的三种群捕食-食饵系统,得到系统至少存在8个正周期解的充分条件。 相似文献
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