“…Further, in many evolutionary processes, the state of the dynamical systems may abruptly change at some point. Consequently, it is natural to assume that these perturbations act instantaneously [17,18,[20][21][22]33,39,40], that is, those processes can be modelled by impulsive dynamical systems. However, the theory of impulsive difference equations have developed a little slowly [24,32,38], and not better than the theory of impulsive differential equation.…”