Existence of almost periodic solutions of functional differential equations of neutral type (Q1191652)

The existence of an almost periodic solution of an almost periodic neutral functional differential equation of the form \({d\over dt}Dx_ t=f(x_ t)\) is established. Here, as usual, \(D\) is Hale's operator and \(x_ t(s)=x(t+s)\), \(-r\leq s\leq 0\).