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Linear Algebra and its Applications
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Linear Algebra and its Applications
Article . 2013
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A satellite of the grand Furuta inequality and its application

Authors: Fujii, Masatoshi; Nakamoto, Ritsuo; Yonezawa, Keisuke;

A satellite of the grand Furuta inequality and its application

Abstract

Let \(A,B\) be bounded linear operators acting on a Hilbert space, \(A \geq B >0\), \(t \in[0,1]\), \(r \geq t\) and \(p, s \geq 1\). The well-known Grand Furuta (GF) inequality says that \[ A^{-r+t}\sharp_{\frac{1-t+r}{(p-t)s+r}} (A^{t}\natural_s B^p) \leq A \] (cf.\ \textit{T. Furuta} [Linear Algebra Appl. 219, 139--155 (1995; Zbl 0822.15008)]). A mean theoretic expression of it induces a satellite of the Grand Furuta (SGF) inequality as \[ A^{-r+t}\sharp_{\frac{1-t+r}{(p-t)s+r}} (A^{t}\natural_s B^p) \leq B \] (cf.\ \textit{M. Fujii} and \textit{E. Kamei} [Sci. Math. Jpn. 56, No. 3, 501--504 (2002; Zbl 1024.47004)]). Here, for \(\alpha \in [0,1]\), \(A\sharp_{\alpha} B\) is the \(\alpha\)-geometric mean defined by \(A^{\frac{1}{2}}(A^{\frac{-1}{2}}BA^{\frac{-1}{2}})^{\alpha}A^{\frac{1}{2}}\) and \(\natural_s\) is a formal extension of \(\sharp_\alpha\). In the paper under review, the authors show that \((SGF; 0\leq t \leq 1)\) has the Löwner-Heinz property, i.e., \((SGF; t = 1)\) implies that \((SGF; t)\) for every \(t \in [0, 1]\). They show that a recent further extension of (GFI) by \textit{T. Furuta} [J. Math. Inequal. 2, No. 4, 465--472 (2008; Zbl 1168.47016)] also has the Löwner-Heinz property.

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Keywords

grand Furuta inequality, Numerical Analysis, Algebra and Number Theory, Operator means involving linear operators, shorted linear operators, etc., Furuta inequality, operator mean, Discrete Mathematics and Combinatorics, Linear operator inequalities, Geometry and Topology, positive operators, Ando-Hiai inequality

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
2
Average
Average
Average
hybrid