ASYMPTOTIC PROPERLIES OF POSITIVE SOLUTIONS AND THE EXISTENCE OF POSITIVE SOLUTIONS OF NONLINEAR NEUTRAL FUNCTIONAL DIFFERENTIAL EQUATIONS
高阶非线性中立型方程正解的渐近性及存在性

In this paper, by the use of the order methods in nonlinear analysis and the thed point theorems of increasing operators,the asymptotic properties of positive solutions of n-th order nonlinear neutral functional differential equations are classified in detail, some sufficient conditions, necessary and sufficient conditions and several examples of the existence of positive solutions of n-th order nonlinear neutral functional differential equations are given.The results obtained include the main results in 4] and 5],and the method of proof is different from those in 4] and 5].