Far East Journal of Mathematical Sciences (FJMS)

The Far East Journal of Mathematical Sciences (FJMS) publishes original research papers and survey articles in pure and applied mathematics, statistics, mathematical physics, and other related fields. It welcomes application-oriented work as well.

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EQUILATERAL DIMENSION OF THE UPPER HALF SPACE WITH HYPERBOLIC TYPE METRIC

Authors

  • Joonhyung Kim

Keywords:

hyperbolic type metric, equilateral dimension

DOI:

https://doi.org/10.17654/0972087125012

Abstract

Let $\mathbb{H}^n$ be the upper half space. Then we define the hyperbolic type metric as follows:

$$
d(x, y)=\log \left(1+c \frac{|x-y|}{\sqrt{x_n y_n}}\right),
$$

where $x=\left(x_1, x_2, \ldots, x_n\right), \quad y=\left(y_1, y_2, \ldots, y_n\right) \in \mathbb{H}^n$ and $c \geq 2$ on $\mathbb{H}^n$. In this paper, we calculate the equilateral dimension of this metric space and show that it is $n+1$.

Received: January 15, 2025
Accepted: March 10, 2025

References

B. V. Dekster, The Jung theorem in metric spaces of curvature bounded above, Proc. Amer. Math. Soc. 125(8) (1997), 2425-2433.

O. Dovgoshey, P. Hariri and M. Vuorinen, Comparison theorems for hyperbolic type metrics, Complex Var. Elliptic Equ. 61 (2016), 1464-1480.

F. W. Gehring and B. G. Osgood, Uniform domains and the quasi-hyperbolic metric, J. Anal. Math. 36 (1979), 50-74.

J. Kim and I. D. Platis, Equilateral dimension of the Heisenberg group, Geom. Dedicata 217 (2023), Paper No. 64, 17 pp.

S. Simic, M. Vuorinen and G. Wang, Sharp Lipschitz constants for the distance ratio metric, Math. Scand. 116 (2015), 86-103.

Y. Wu, G. Wang, G. Jia and X. Zhang, Lipschitz constants for hyperbolic type metric under Mobius transformations, Czech. Math. J. 74(149) (2024), 445-460.

Published

2025-05-02

Issue

Section

Articles

How to Cite

EQUILATERAL DIMENSION OF THE UPPER HALF SPACE WITH HYPERBOLIC TYPE METRIC. (2025). Far East Journal of Mathematical Sciences (FJMS), 142(2), 203-210. https://doi.org/10.17654/0972087125012

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