【摘要】 研究ｎ阶中立型时滞微分方程ｄｎｄｔｎ［ｘ（ｔ）＋ｐ（ｔ）ｘ（ｔ－τ）］＋ｆ［ｔ，ｘ（ｔ－τ１（ｔ）），…，ｘ（ｔ－τｋ（ｔ））］＝０，ｔ≥ｔ０，其中ｎ≥１是奇数，在对ｆ较弱限制及对ｐ（ｔ）适当限制下，获得该方程正解存在的充分条件更多还原

【Abstract】 order neutral delay differential equationd ndt n[x(t)+p(t)x(t-τ)]+f[t,x(t-τ 1(t)),…,x(t-τ k(t))]=0,t≥t 0,where n≥1 is an odd integer.Some sufficient conditions are obtained for the existence of a positive solution of the equation under the conditions of weaker limitation for the function f and proper limitation for the function p更多还原