Zhang, ZhenguoWang, ChunjiaoLi, QiaoluanLi, Fang2021-05-242021-05-242005-05-19Zhang, Z., Wang, C., Li, Q., & Li, F. (2005). Throughout positive solutions of second-order nonlinear differential equations. <i>Electronic Journal of Differential Equations, 2005</i>(53), pp. 1-12.1072-6691https://hdl.handle.net/10877/13636In this paper, we consider the second-order nonlinear and the nonlinear neutral functional differential equations (α(t)x'(t))' + ƒ(t, x(g(t))) = 0, t ≥ t0 (α(t)(x(t) - p(t)x(t - τ))')' + ƒ(t, x(g(t))) = 0, t ≥ t0. Using the Banach contraction mapping principle, we obtain the existence of throughout positive solutions for the above equations.Text12 pages1 file (.pdf)enAttribution 4.0 InternationalNonlinear differential equationsNeutral termEventually positive solutionThroughout positive solutionArticle