Comparison of hyperbolic metric and triangular ratio metric in a square
Abstract
Let $K$ be a square in the plane and $ρ_K(x,y)$ be the hyperbolic distance between $x$, $y\in K$. Denote by $s_K(x,y)$ the triangular ratio metric in $K$; for $x\neq y$ the value of $s_K(x,y)$ equals the ratio of the Euclidean distance $|x-y|$ between $x$, $y\in K$ to the value $\inf_{z\in \partial K}(|x-z|+|z-y|)$. We obtain a sharp estimate for the ratio of $þ(ρ_K(x,y)/2)$ to $s_K(x,y)$.
Fields of Study & Subjects
Analytic and geometric function theory
Mathematics and Applications
Holomorphic and Operator Theory
Publication details
- Journal / source
- arXiv (Cornell University)
- Publication date
- 4 February 2026
- Document type
- Preprint