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Total nonnegativity of matrices related to polynomial roots and poles of rational functions

  • In this paper totally nonnegative (positive) matrices are considered which are matrices having all their minors nonnegative (positve); the almost totally positive matrices form a class between the totally nonnegative matrices and the totally positive ones. An efficient determinantal test based on the Cauchon algorithm for checking a given matrix for falling in one of these three classes of matrices is applied to matrices which are related to roots of polynomials and poles of rational functions, specifically the Hankel matrix associated with the Laurent series at infinity of a rational function and matrices of Hurwitz type associated with polynomials. In both cases it is concluded from properties of one or two finite sections of the infinite matrix that the infinite matrix itself has these or related properties. Then the results are applied to derive a sufficient condition for the Hurwitz stability of an interval family of polynomials. Finally, interval problems for a subclass of the rational functions, viz. R-functions, are investigated. These problems include invariance of exclusively positive poles and exclusively negative roots in the presence of variation of the coefficients of the polynomials within given intervals.

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Author:Mohammad AdmORCiDGND, Jürgen GarloffORCiDGND, Jihad Titi
Parent Title (English):Journal of Mathematical Analysis and Applications
Place of publication:Amsterdam
Document Type:Article
Year of Publication:2016
Release Date:2019/05/16
Tag:Totally nonnegative matrix; Totally positive matrix; Hurwitz matrix; Hankel matrix; R-function
First Page:780
Last Page:797
Open Access?:Ja
Relevance:Peer reviewed Publikation in Master Journal List
Licence (German):License LogoUrheberrechtlich geschützt