The Hurwitz polynomial reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Hurwitz polynomial

A Hurwitz polynomial is a polynomial whose coefficients are positive real numbers and whose zeros are located in the left half-plane of the complex plane, that is, the real part of every zero is negative.

A simple example of a Hurwitz polynomial is the following:

The only real solution is −1, as it factors to:

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