The stability radius is a concept used in control theory and systems analysis to measure the robustness of a control system with respect to changes in its parameters or structure. Specifically, it quantifies the maximum amount of perturbation (or change) that can be introduced to a system before it becomes unstable. ### Key points related to stability radius: 1. **Perturbation**: This refers to any changes in the system dynamics, such as alterations in system parameters, modeling errors, or external disturbances.
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