R
Roger A. Horn
Researcher at University of Utah
Publications - 116
Citations - 43480
Roger A. Horn is an academic researcher from University of Utah. The author has contributed to research in topics: Matrix (mathematics) & Canonical form. The author has an hindex of 32, co-authored 116 publications receiving 41610 citations. Previous affiliations of Roger A. Horn include Johns Hopkins University & Stanford University.
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The singular values of a Hadamard product : a basic inequality
TL;DR: In this paper, the Hadamard product of two n-by-n complex matrices X and Y is shown to have a singular vaiuc of order σ 1 (C) ⩾ σ n (C), where C denotes the Euclidean length of the columns of Z, arranged in descending order.
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Congruences of a square matrix and its transpose
TL;DR: In this article, it was shown that A and AT are ∗ congruent over any field F of characteristic not two with involution a↦ a (the involution can be the identity).
Journal Article
The Severity of Illness Index as a severity adjustment to diagnosis-related groups.
TL;DR: This article discusses the Severity of Illness case-mix groups, and suggests a refinement to diagnosis-related groups (DRG's) designed to accommodate the important element of patient severity, which is presented in a discussion of the efficient production of hospital services.
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Cauchy-Schwarz inequalities associated with positive semidefinite matrices
Roger A. Horn,Roy Mathias +1 more
TL;DR: In this paper, a quasilinear representation for unitarily invariant norms is proposed, and a basic inequality of the Cauchy-schwarz type is proved.