@techreport{Adm2013Inter-25005,
  year={2013},
  series={Konstanzer Schriften in Mathematik},
  title={Intervals of Totally Nonnegative Matrices},
  number={321},
  author={Adm, Mohammad and Garloff, Jürgen}
}

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    <dcterms:abstract xml:lang="eng">Totally nonnegative matrices, i.e., matrices having all their minors nonnegative, and matrix intervals with respect to the checkerboard ordering are considered. It is proven that if the two bound matrices of such a matrix interval are nonsigular and totally nonnegative (and in addition all their zero minors are identical) then all matrices from this matrix interval are also nonsingular and totally nonnegative (with identical zero minors).</dcterms:abstract>
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