Completely positive matrices of order $5$ with $\widehat{CP}$-graph

Authors

  • M. Cedolin
  • L. Salce

Keywords:

doubly non-negative matrices, completely positive matrices, $\widehat{CP}$-graphs

Abstract

We characterize completely positive matrices of order five whose associated graph is a $\widehat{CP}$-graph not completely positive, unifying and improving results obtained by Xu. We show by counterexamples that two characterizations obtained by Xu are incorrect

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Published

21-12-2016

Issue

Volume 36, Issue 1 (2016)

Section

Articoli

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