Existence and uniqueness of periodic solutions for a kind of first order neutral functional differential equations

In this paper, we use the coincidence degree theory to establish new results on the existence and uniqueness of T-periodic solutions for the first order neutral functional differential equation of the form(x(t)+Bx(t−δ))′=g1(t,x(t))+g2(t,x(t−τ))+p(t).(x(t)+Bx(t−δ))′=g1(t,x(t))+g2(t,x(t−τ))+p(t).