Abstract
In this paper, the asymptotic stability of linear discrete time-invariant descriptor systems is studied via a generalized Lyapunov equation. The analysis covers both the causal and noncausal cases. In particular, the asymptotic stability of a discrete descriptor system (DDS) is related to the existence of a positive semidefinite solution of the generalized Lyapunov equation. The results strengthened those of earlier works for causal descriptor systems.
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