Stability of Delay Time-varying Discrete Interval Systems

The stability criteria for delay time-varying discrete systems are first given.Then,based on Lyapunov stability theory and applied the vector comparison theorem,stability for delay time-varying interval coefficient discrete systems is studied and robust stability for delay time-varying discrete linear systems with nonlinear time-varying perturbations is also considered.Some sufficient conditions are obtained.The new results derived in this paper include the main results in some previous paper.