Preservation of fundamental properties in n-D systems using S/sub n/ functions

In this paper structural stability of n-D systems, positive real systems and strict positive real systems are preserved, using a new class of functions called S/sub n/ functions. Moreover, a closure property under composition of functions in several variables for S/sub n/ functions, is proven. Based in that fact, we present results on preservation of structural stabilization and simultaneous structural stabilization.

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