On the Ptolemy constant of some concrete Banach spaces
Zhanfei Zuo · Mathematical Inequalities & Applications · 2018
In this paper, we firstly consider the relations involving the Ptolemy constant of the norms . and . , where the convex functions and and are comparable. Secondly, we determine this constant when norm is a mean of two norms. Finally, the constant was calculated for some concrete Banach spaces.