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The frequency at which the phase angle of the transfer function is -180 degrees. This frequency is useful for determining gain margin on the Nyquist plot.

A concept referring to whether a system with feedback tends to return to its equilibrium state after a disturbance, as analyzed by the Nyquist plot.

A function that characterizes the input-output relationship of a system without feedback, used in generating the Nyquist plot.

A value of 's' for which the transfer function becomes zero. Zeros affect the shape of the Nyquist plot but not directly the stability.

A graphical method for determining the stability of a closed-loop system by counting the number of clockwise encirclements of the critical point (-1,0j).

A measure of how much gain can increase before a system becomes unstable, obtained from the Nyquist plot as the inverse of the gain at the phase crossover frequency.

Though not part of the Nyquist plot, it's a precursor that shows the gain and phase of a system as functions of frequency which can inform the Nyquist plot.

A value of 's' for which the transfer function becomes infinite. Poles to the right of the imaginary axis in the complex plane imply system instability.

The frequency at which the magnitude of the transfer function equals one (0 dB). This frequency is critical for determining phase margin on the Nyquist plot.

The point in the Nyquist plot (-1,0j) around which the number of encirclements determines the stability of the closed-loop system.

The contour in the complex plane used to trace the frequency response of the open-loop system and create the Nyquist plot.

The act of tracing the Nyquist plot around the critical point; can be clockwise or counterclockwise, indicating different implications for system stability.

A quantitative measure of how close a system is to instability, such as gain margin or phase margin derived from the Nyquist plot.

A graphical representation of the frequency response of a system used to predict stability. It plots the complex-valued transfer function as a function of frequency.