Discrete-time systems are mathematical models that describe processes in which signals or states are defined at distinct time intervals, rather than continuously over time. In this context, these systems are often represented using sequences and transformations applied to them, allowing for analysis in terms of periodicity, stability, and convergence. They play a significant role in understanding how sequences evolve over time and provide a foundation for concepts like the Wiener-Wintner theorem and its generalizations.
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