高阶中立型时滞差分方程正解的存在性

Existence of Positive Solution for Higher Order Neutral Delay Difference Equations

考虑l＋1阶中立型差分方程在对f较弱的限制条件下，本文绘出了方程（*）当p≠-1时存在正解的充分条件以及当p=-1时存在有界正解的充分必要条件．

Consider the l＋1 order neutral difference equationSufficient conditions are obtained for the existence of a positive solution of equation (* ) with p≠-1 Moreover, the sufficient and necessary conditions are obtained for the existence of a bounded positive solution of equation (*) with p=-1