Necessary and sufficient conditions are obtained for the existence of positive solutions of a nonlinear differential equation. Relations between this equation and an advanced type nonlinear differential equation are also discussed. (C) 1998 Academic Press.
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Jilin Univ, Sch Math, Changchun 130012, Peoples R ChinaJilin Univ, Sch Math, Changchun 130012, Peoples R China
Han, Xiao
He, Yujing
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Jilin Univ, Sch Math, Changchun 130012, Peoples R China
Tianjin Binhai Foreign Language Sch, Tianjin 300450, Peoples R ChinaJilin Univ, Sch Math, Changchun 130012, Peoples R China
He, Yujing
Wei, Hui
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Luoyang Normal Univ, Dept Math, Luoyang 471934, Peoples R ChinaJilin Univ, Sch Math, Changchun 130012, Peoples R China