Exponential [formula omitted]-stability for a class of linear systems governed by continuous-time difference equations.

Linear systems governed by continuous-time difference equations cover a wide class of linear systems. From the Lyapunov–Krasovskii approach, we investigate L 2 -stability for such a class of systems. Sufficient conditions, and in some particular cases, necessary and sufficient conditions for exponential L 2 -stability are established, for multivariable systems with commensurate or rationally independent delays. An analysis of discontinuities evolution appearing in the system response is proposed. Finally, a robustness issue is discussed for time-varying delays. [ABSTRACT FROM AUTHOR]