Hurwitz polynomial
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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:

The original article can be found at: http://en.wikipedia.org/wiki/Hurwitz_polynomial.
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