Positive periodic solution to superlinear neutral differential equation with time-dependent parameter

In this paper, we prove the existence of a positive omega-periodic solution for second-order neutral differential equation with sub-linearity, semi-linearity and super-linearity conditions by application of a fixed point theorem of Leray-Schauder type. At last, we present an example to illustrate our results. (C) 2019 Published by Elsevier Ltd.