
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.
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
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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