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zbMATH Open
Article . 2009
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Inequalities for J-contractions involving the alpha-power mean

Inequalities for \(J\)-contractions involving the \(\alpha\)-power mean
Authors: Soares, Graça;

Inequalities for J-contractions involving the alpha-power mean

Abstract

For a selfadjoint involution matrix \(J\) on \(\mathbb{C}^{n}\), i.e., \(J=J^{*}\) and \(J^{2}=J\), one can consider \(\mathbb{C}^{n}\) with the indefinite Krein space structure endowed by the indefinite inner product \([x,y]:=y^{*}Jx\). Several authors have studied properties of the Krein space, especially, matrix inequalities based on the indefinite inner product. For two matrices \(A\) and \(B\) satisfying \(A=JA^{*}J\) and \(B=JB^{*}J\), \(A\geq^{J}B\) means that \([Ax,x]\geq [Bx,x]\) for all \(x\in\mathbb{C}^{n}\) if and only if \(JA-JB\) is positive. From the order relation, Löwner-Heinz and Furuta inequalities were derived in [\textit{T.\,Ando}, Linear Algebra Appl.\ 385, 73--80 (2004; Zbl 1059.15025)] and [\textit{T.\,Sano}, Math.\ Inequal.\ Appl.\ 10, No.\,2, 381--387 (2007; Zbl 1141.47014)], respectively. In this paper, the author obtains satellite theorems of the Furuta inequality for the indefinite inner product. Results were already shown for the usual inner product by \textit{E.\,Kamei} in [Math.\ Jap.\ 33, No.\,6, 883--886 (1988; Zbl 0672.47015), Math.\ Jap.\ 49, No.\,~1, 65--71 (1999; Zbl 0934.47009)].

Country
Portugal
Keywords

Linear operators on spaces with an indefinite metric, \(\alpha\)-power mean, Miscellaneous inequalities involving matrices, Furuta inequality, \(J\)-selfadjoint matrix, \(J\)-chaotic order, Linear operator inequalities

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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.
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