Hadamard Products of Stable Polynomials Are Stable

Author: Garloff J.   Wagner D.G.  

Publisher: Academic Press

ISSN: 0022-247X

Source: Journal of Mathematical Analysis and Applications, Vol.202, Iss.3, 1996-09, pp. : 797-809

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Abstract

A real polynomial is (asymptotically) stable when all of its zeros lie in the open left half of the complex plane. We show that the Hadamard (coefficient-wise) product of two stable polynomials is again stable, improving upon some known results. Via the associated Hurwitz matrices we find another example of a class of totally nonnegative matrices which is closed under Hadamard multiplication.