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不稳定型高阶中立型方程正解的存在性与有界振动
引用本文:唐先华.不稳定型高阶中立型方程正解的存在性与有界振动[J].衡阳师范学院学报,1996(6).
作者姓名:唐先华
作者单位:中南工业大学数软系!长沙410083
摘    要:本文研究一类不稳定型高阶中立型微分方程正解的存在性与有界振动。证明了在一定条件下不稳定型n阶中立型方程总存在无界正解,并给出了保证偶数阶方程的一切有界解都振动的充分条件及充要条件,全面推广了文献《二阶中立型微分方程解的振动性》(张炳根.科学通报,1989,34(8):563~566)、《二阶中立型微分方程解的振动性》(庚建设,科学通报,1989,34(22):1754~1755)、《不稳定型二阶中立型方程正解的存在性与有界振动》(庚建设,张炳根,系统科学与数学,1996,16(1)92~96),中相应结果。

关 键 词:中立型方程  不稳定型  正解  振动性  有界解

THE EXISTENCE OF POSITIVE SOLUTIONS AND BOUNDED OSCILLATION FOR HIGH-ORDER NEUTRAL EQUATIONS OF UNSTABLE
Tang Xianhua.THE EXISTENCE OF POSITIVE SOLUTIONS AND BOUNDED OSCILLATION FOR HIGH-ORDER NEUTRAL EQUATIONS OF UNSTABLE[J].journal of Hengyang Normal University,1996(6).
Authors:Tang Xianhua
Abstract:In this paper,we study the existence of positive solutions and the bounded oscillation of a class of high order unstable type neutral differential equations. we prove that this equation always has an unbounded positive solution under some conditions,and give some sufficient conditions for all bounded solutions of the even order equation to oscillate,which generalize the related results in Ref. 1, 2, 3]
Keywords:Neutral equation  unstable type  positive solution  oscillation  bounded solution
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