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Commun. Math. Res., 32 (2016), pp. 272-280.
Published online: 2021-05
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In this paper, we study the existence of multiple positive periodic solutions for the second order differential equation $$x''(t) + p(t)x' (t) + q(t)x(t) = f(t, x(t)).$$ By using Krasnoselskii fixed point theorem, we establish some criteria for the existence and multiple positive periodic solutions for this differential equation.
}, issn = {2707-8523}, doi = {https://doi.org/10.13447/j.1674-5647.2016.03.09}, url = {http://global-sci.org/intro/article_detail/cmr/18899.html} }In this paper, we study the existence of multiple positive periodic solutions for the second order differential equation $$x''(t) + p(t)x' (t) + q(t)x(t) = f(t, x(t)).$$ By using Krasnoselskii fixed point theorem, we establish some criteria for the existence and multiple positive periodic solutions for this differential equation.