Steiner Ratio and Steiner-Gromov Ratio of Gromov-Hausdorff Space

Abstract

In the present paper we investigate the metric space $\mathcal{M}$ consisting of isometry classes of compact metric spaces, endowed with the Gromov-Hausdorff metric. We show that for any finite subset $M$ from a sufficiently small neighborhood of a generic finite metric space, providing $M$ consists of finite metric spaces with the same number of points, each Steiner minimal tree in $\mathcal{M}$ connecting $M$ is a minimal filling for $M$. As a consequence, we prove that the both Steiner ratio and Gromov-Steiner ratio of $\mathcal{M}$ are equal to $1/2$.

6 pages