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In this paper we describe by a number of examples how to deduce one singlecharacterizing higher order differential equation for output quantities of ananalog circuit.  In the linear case, we apply basic "symbolic" methods from linear algebra tothe system of differential equations which is used to model the analog circuit.For nonlinear circuits and their corresponding nonlinear differentialequations, we show how to employ computer algebra tools implemented in Maple,which are based on differential algebra.

"E pluribus unum" or How to Derive Single-equation Descriptions for Output-quantities in Nonlinear Circuits using Differential Algebra