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Given a complex-valued function which depends on real variables and complex parameters , we describe a method of finding the zero set of all zeros of in some given set in when each parameter is allowed to vary in some given set in the extended complex plane . This mathematical tool is applied in the paper to determine the complete space of output (or state) feedback gains, which allows robust stabilization of a linear MIMO system under uncertainty conditions. The system may be continuous or discrete. Also, the stabilization may be "relative," i.e., with safety margins. Design examples are provided.