Title : ( Geometric aspects of $p$-angular and skew p-angular distances )
Authors: J. Rooin , S. Habibzadeh , Mohammad Sal Moslehian ,Access to full-text not allowed by authors
Abstract
Corresponding to the concept of $p$-angular distance $\alpha_p[x,y]:=\left\lVert\lVert x\rVert^{p-1}x-\lVert y\rVert^{p-1}y\right\rVert$, we first introduce the notion of skew $p$-angular distance $\beta_p[x,y]:=\left\lVert \lVert y\rVert^{p-1}x-\lVert x\rVert^{p-1}y\right\rVert$ for non-zero elements of $x, y$ in a real normed linear space and study some of significant geometric properties of the $p$-angular and the skew $p$-angular distances. We then give some results comparing two different $p$-angular distances with each other. Finally, we present some characterizations of inner product spaces related to the $p$-angular and the skew $p$-angular distances. In particular, we show that if $p>1$ is a real number, then a real normed space $\mathcal{X}$ is an inner product space, if and only if for any $x,y\in \mathcal{X}\smallsetminus{\lbrace 0\rbrace}$, it holds that $\alpha_p[x,y]\geq\beta_p[x,y]$.
Keywords
, $p$-angular distance, skew $p$-angular distance, inequality, characterization of inner product spaces.@article{paperid:1069776,
author = {J. Rooin and S. Habibzadeh and Sal Moslehian, Mohammad},
title = {Geometric aspects of $p$-angular and skew p-angular distances},
journal = {Tokyo Journal of Mathematics},
year = {2018},
volume = {41},
number = {1},
month = {January},
issn = {0387-3870},
pages = {253--272},
numpages = {19},
keywords = {$p$-angular distance; skew $p$-angular distance; inequality; characterization of inner product spaces.},
}
%0 Journal Article
%T Geometric aspects of $p$-angular and skew p-angular distances
%A J. Rooin
%A S. Habibzadeh
%A Sal Moslehian, Mohammad
%J Tokyo Journal of Mathematics
%@ 0387-3870
%D 2018