Fallat, Shaun M.; van den Driessche, P.

On matrices with all minors negative

Electron. J. Linear Algebra 7, 92-99, electronic only (2000)

Summary

Summary: A matrix is called sign regular of order k if every minor of order i has the same sign for each i = 1; 2; : : : ; k. At one extreme of the sign regular matrices lies the well studied and important class of totally positive matrices. The purpose here is to initiate a study of the other extreme of sign regular matrices, namely the totally negative matrices (i.e., all minors negative). Many aspects of this class are considered including: existence, spectral properties, inverses, Schur complements, and factorizations.

Mathematics Subject Classification

15A48

Keywords/Phrases

minors, sign regular matrices, totally positive, totally negative

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