Almost periodic solutions of second-order neutral equations with piecewise constant arguments

In this paper, we present a theorem on the almost periodic solutions of second-order neutral equations with piecewise constant arguments of the form (x(t)+px(t−1))″=qx([t])+f(t), where [⋅] denotes the greatest integer function, p,q (|p|>1 or p=−1) are nonzero constants, and f(t) is almost periodic.