Metric Segments in Gromov--Hausdorff class
Abstract
We study properties of metric segments in the class of all metric spaces considered up to an isometry, endowed with Gromov--Hausdorff distance. On the isometry classes of all compact metric spaces, the Gromov-Hausdorff distance is a metric. A metric segment is a class that consists of points lying between two given ones. By von Neumann--Bernays--G\"odel (NBG) axiomatic set theory, a proper class is a "monster collection", e.g., the collection of all cardinal sets. We prove that any metric segment in the proper class of isometry classes of all metric spaces with the Gromov-Hausdorff distance is a proper class if the segment contains at least one metric space at positive distances from the segment endpoints. In addition, we show that the restriction of a non-degenerated metric segment to compact metric spaces is a non-compact set.
Cite
@article{arxiv.2009.13273,
title = {Metric Segments in Gromov--Hausdorff class},
author = {Olga Borisova},
journal= {arXiv preprint arXiv:2009.13273},
year = {2020}
}