On Symmetry of Birkhoff-James Orthogonality of Linear Operators on Finite-dimensional Real Banach Spaces

Abstract

We characterize left symmetric linear operators on a finite dimensional strictly convex and smooth real normed linear space $\mathbb{X},$ which answers a question raised recently by one of the authors in \cite{S} [D. Sain, \textit{Birkhoff-James orthogonality of linear operators on finite dimensional Banach spaces, Journal of Mathematical Analysis and Applications, accepted, $2016$}]. We prove that $T\in B(\mathbb{X})$ is left symmetric if and only if $T$ is the zero operator. If $\mathbb{X}$ is two-dimensional then the same characterization can be obtained without the smoothness assumption. We also explore the properties of right symmetric linear operators defined on a finite dimensional real Banach space. In particular, we prove that smooth linear operators on a finite-dimensional strictly convex and smooth real Banach space can not be right symmetric.Comment: arXiv admin note: text overlap with arXiv:1607.0848