Abstract-For a general class of nonlinear networks, explicit expressions for sensitivities of a response due to nonlinear elements are derived. These expressions are used to establish invariance rela-tionships for the sums of sensitivities over different sets of parame-ters of two classes of nonlinear networks. It is indicated how these relationships can be used to establish the invariant nature of the sum of higher order sensitivities and a lower bound for the quadratic sensitivity index. I
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