Minimal and Maximal Distances in Metric Spaces
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arXiv
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866918084107829248 |
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| author | Ranđelović, Žarko |
| author_facet | Ranđelović, Žarko |
| contents | Given functions $f,g: [n] \rightarrow [n]$ do there exist $n$ points $A_1,A_2\ldots A_n$ in some metric space such that $A_{f(i)},A_{g(i)}$ are the points closest and farthest from point $A_i$? In this paper we characterize precisely which pairs of functions have this property. If the metric space is $\mathbb{R}^k$ we show that the maximal number $m(k)$ so that any pair of functions $f,g: [m(k)]\rightarrow [m(k)]$ realizable in some metric space is also realizable in $\mathbb{R}^k$ grows exponentially in $k$. In the final section of this paper we consider what happens when we look at minimal and maximal distances separately. We show that any function $g$ that can be a maximal distance function can also be a maximal distance function in $\mathbb{R}^2$. We also find an interesting family of functions that can be minimal distance functions but not in $\mathbb{R}^k$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_14648 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Minimal and Maximal Distances in Metric Spaces Ranđelović, Žarko Metric Geometry Combinatorics 52C99, 52C10 Given functions $f,g: [n] \rightarrow [n]$ do there exist $n$ points $A_1,A_2\ldots A_n$ in some metric space such that $A_{f(i)},A_{g(i)}$ are the points closest and farthest from point $A_i$? In this paper we characterize precisely which pairs of functions have this property. If the metric space is $\mathbb{R}^k$ we show that the maximal number $m(k)$ so that any pair of functions $f,g: [m(k)]\rightarrow [m(k)]$ realizable in some metric space is also realizable in $\mathbb{R}^k$ grows exponentially in $k$. In the final section of this paper we consider what happens when we look at minimal and maximal distances separately. We show that any function $g$ that can be a maximal distance function can also be a maximal distance function in $\mathbb{R}^2$. We also find an interesting family of functions that can be minimal distance functions but not in $\mathbb{R}^k$. |
| title | Minimal and Maximal Distances in Metric Spaces |
| topic | Metric Geometry Combinatorics 52C99, 52C10 |
| url | https://arxiv.org/abs/2409.14648 |