Mirror symmetry of SRG uncertainty regions about the theta-axis gives necessary and sufficient conditions for robust nonsingularity and stability of LTI systems via the Davis-Wielandt shell.
Vinnicombe,Uncertainty and Feedback:H ∞ Loop-Shaping and theν-Gap Metric
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Symmetry Is Almost All You Need: Robust Stability with Uncertainty Induced by Symmetric SRG Regions
Mirror symmetry of SRG uncertainty regions about the theta-axis gives necessary and sufficient conditions for robust nonsingularity and stability of LTI systems via the Davis-Wielandt shell.