A class of nonlinear simple form differential delay equations with a $T$-periodic coefficient and constant $\tau >0$ is considered. It shown that for an arbitrary value the period $T>4\tau -d_0$, some $d_0>0$, there equation in such it possesses asymptotically stable $T$-period solution. The periodic solutions are constructed explicitly piecewise nonlinearities coefficients involved, by reducti...

In this paper, we consider the almost periodic solutions of a discrete cooperation system with feedback controls. Assuming that the coefficients in the system are almost periodic sequences, we obtain the existence and uniqueness of the almost periodic solution which is uniformly asymptotically stable. Keywords—Discrete cooperation model; Almost periodic solution; Feedback control; Lyapunov func...