Spectral Nevanlinna-Pick interpolation theory and robust stabilization
Tannenbaum, Allen R.
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In this note we will discuss a new kind of interpolation theory in which one bounds the spectral radius of the matrix-valued interpolating functions instead of the norm as is the case with ordinary Nevanlinna-Pick interpolation. We show how this is related to certain kinds of multivariate stability margin problems of the kind considered by Doyle  and Safonov .