Auxiliary Polynomial

An auxiliary polynomial is a polynomial formed from selected coefficients of a system’s characteristic equation, most commonly to resolve special cases in the Routh-Hurwitz stability test. In a Routh array, engineers construct it from the row immediately above a row of zeros, then differentiate it and use the derivative’s coefficients to continue the array. This procedure reveals symmetry in the characteristic equation and identifies possible roots on the imaginary axis. Auxiliary polynomials therefore help assess stability, detect marginally stable behavior, and analyze control-system dynamics when the standard Routh calculation cannot proceed directly.

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