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arXiv · 2512.18975

On $\ell_1$ embeddings of finite metric spaces, and sphere-of-influence graphs

Stanislav Jabuka·Ehsan Mirbagheri
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Abstract

We introduce the {\em pair-cut cone $PCUT_n$} of metrics on sets with $n\ge 3$ elements, that correspond to linear combinations with non-negative coefficients of the cut-metrics resulting from cuts that are pairs. Given a metric, we fully characterize membership in the pair-cut cone in terms of quantities computed from the metric directly. We also prove a new result by which a metric $d$ that satisfies a system of inequalities, lies in the (full) cut cone of metrics, making it $\ell_1$-embeddable into Euclidean space. We give applications of our results to the $\ell_1$-embeddability of simple graphs into Euclidean space as {\em sphere-of-influence graphs}. We exhibit an example of a simple graph that admits no such $\ell_1$-metric in the pair-cut cone.

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Stanislav Jabuka, Ehsan Mirbagheri. 2025-12-22. On $\ell_1$ embeddings of finite metric spaces, and sphere-of-influence graphs. https://arxiv.org/abs/2512.18975

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