%0 Journal Article
%T Positive periodic solutions of neutral functional differential equations with a parameter and impulse
%A Xuanlong Fan
%A Yongkun Li
%J Electronic Journal of Differential Equations
%D 2008
%I Texas State University
%X In this paper, we consider first-order neutral differential equations with a parameter and impulse in the form of $$displaylines{ frac{d}{dt}[x(t)-c x(t-gamma)]=-a(t)g(x(h_1(t)))x(t)+lambda b(t) fig(x(h_2(t))ig),quad t eq t_j;cr Delta ig[x(t)-c x(t-gamma)ig]=I_jig(x(t)ig),quad t=t_j,; jinmathbb{Z}^+. }$$ Leggett-Williams fixed point theorem, we prove the existence of three positive periodic solutions.
%K Periodic solution
%K functional differential equation
%K fixed point
%K cone
%U http://ejde.math.txstate.edu/Volumes/2008/38/abstr.html