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Two characterizations of matrices with the Perron–Frobenius property

✍ Scribed by Abed Elhashash; Daniel B. Szyld


Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
77 KB
Volume
16
Category
Article
ISSN
1070-5325

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✦ Synopsis


Abstract

Two characterizations of general matrices for which the spectral radius is an eigenvalue and the corresponding eigenvector is either positive or nonnegative are presented. One is a full characterization in terms of the sign of the entries of the spectral projector. In another case, different necessary and sufficient conditions are presented that relate to the classes of the matrix. These characterizations generalize well‐known results for nonnegative matrices. Copyright © 2009 John Wiley & Sons, Ltd.


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Seymour proved that the set of odd circuits of a signed binary matroid ðM; SÞ has the Max-Flow Min-Cut property if and only if it does not contain a minor isomorphic to ðMðK 4 Þ; EðK 4 ÞÞ: We give a shorter proof of this result. # 2002 Elsevier Science (USA)