An extension of a result of Lewis.
A. Horn's result on matrices with prescribed singular values and eigenvalues.
A counterexample to Merikoski-Kumar conjecture on the product of normal matrices.
Unitary completions of complex symmetric and skew symmetric matrices.
Some bounds for the spectral radius of the Hadamard product of matrices.
A Unified Extension of Some Results of Thompson, Marcus and Moyls.
Extension of Wang-Gong monotonicity result in semisimple Lie groups
We extend a monotonicity result of Wang and Gong on the product of positive definite matrices in the context of semisimple Lie groups. A similar result on singular values is also obtained.
Extensions of Three Matrix Inequalities to Semisimple Lie Groups
We give extensions of inequalities of Araki-Lieb-Thirring, Audenaert, and Simon, in the context of semisimple Lie groups.
Derivatives of orbital function and an extension of Berezin-Gel’fand’s theorem
A generalization of a result of Berezin and Gel’fand in the context of Eaton triples is given. The generalization and its proof are Lie-theoretic free and requires some basic knowledge of nonsmooth analysis. The result is then applied to determine the distance between a point and a G-orbit or its convex hull.We also discuss the derivatives of some orbital functions.
Geometry and inequalities of geometric mean
We study some geometric properties associated with the -geometric means of two positive definite matrices and . Some geodesical convexity results with respect to the Riemannian structure of the positive definite matrices are obtained. Several norm inequalities with geometric mean are obtained. In particular, we generalize a recent result of Audenaert (2015). Numerical counterexamples are given for some inequality questions. A conjecture on the geometric mean inequality regarding pairs...
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