正负系数中立型时滞差分方程有界正解的存在性

Existence of Bounded Positive Solutions in Neutral Delay Difference Equation with Positive and Negative Coefficients

考虑正负系数中立型时滞差分方程△（ ｘｎ＋ １ － ｐｎｘｎ） ＋ ｑｎｘｎ－ ｋ１ － ｒｎｘｎ－ ｋ２ ＝ ０ ，获得了该方程存在有界正解的充要条件．

The neutral delay difference equation with positive and negative coefficients △(x n+1 -p nx n)+q nx n-k 1 -r nx n-k 2 =0 is discussed.Sufficient and necessary condition are obtained for the equation with a bounded positive solution.