A Mattila-Sjölin theorem for simplices in low dimensions

Fuente: arXiv
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Main Authors: Palsson, Eyvindur Ari, Acosta, Francisco Romero
Format: Preprint
Published: 2022
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author Palsson, Eyvindur Ari
Acosta, Francisco Romero
author_facet Palsson, Eyvindur Ari
Acosta, Francisco Romero
contents In this paper we show that if a compact set $E \subset \mathbb{R}^d$, $d \geq 3$, has Hausdorff dimension greater than $\frac{(4k-1)}{4k}d+\frac{1}{4}$ when $3 \leq d<\frac{k(k+3)}{(k-1)}$ or $d- \frac{1}{k-1}$ when $\frac{k(k+3)}{(k-1)} \leq d$, then the set of congruence class of simplices with vertices in $E$ has nonempty interior. By set of congruence class of simplices with vertices in $E$ we mean $$Δ_{k}(E) = \left \{ \vec{t} = (t_{ij}) : |x_i-x_j|=t_{ij} ; \ x_i,x_j \in E ; \ 0\leq i < j \leq k \right \} \subset \mathbb{R}^{\frac{k(k+1)}{2}}$$ where $2 \leq k <d$. This result improves our previous work in the sense that we now can obtain a Hausdorff dimension threshold which allow us to guarantee that the set of congruence class of triangles formed by triples of points of $E$ has nonempty interior when $d=3$ as well as extending to all simplices. The present work can be thought of as an extension of the Mattila-Sjölin theorem which establishes a non-empty interior for the distance set instead of the set of congruence classes of simplices.
format Preprint
id arxiv_https___arxiv_org_abs_2208_07198
institution arXiv
publishDate 2022
record_format arxiv
spellingShingle A Mattila-Sjölin theorem for simplices in low dimensions
Palsson, Eyvindur Ari
Acosta, Francisco Romero
Classical Analysis and ODEs
Metric Geometry
28A75, 42B20, 52C10
In this paper we show that if a compact set $E \subset \mathbb{R}^d$, $d \geq 3$, has Hausdorff dimension greater than $\frac{(4k-1)}{4k}d+\frac{1}{4}$ when $3 \leq d<\frac{k(k+3)}{(k-1)}$ or $d- \frac{1}{k-1}$ when $\frac{k(k+3)}{(k-1)} \leq d$, then the set of congruence class of simplices with vertices in $E$ has nonempty interior. By set of congruence class of simplices with vertices in $E$ we mean $$Δ_{k}(E) = \left \{ \vec{t} = (t_{ij}) : |x_i-x_j|=t_{ij} ; \ x_i,x_j \in E ; \ 0\leq i < j \leq k \right \} \subset \mathbb{R}^{\frac{k(k+1)}{2}}$$ where $2 \leq k <d$. This result improves our previous work in the sense that we now can obtain a Hausdorff dimension threshold which allow us to guarantee that the set of congruence class of triangles formed by triples of points of $E$ has nonempty interior when $d=3$ as well as extending to all simplices. The present work can be thought of as an extension of the Mattila-Sjölin theorem which establishes a non-empty interior for the distance set instead of the set of congruence classes of simplices.
title A Mattila-Sjölin theorem for simplices in low dimensions
topic Classical Analysis and ODEs
Metric Geometry
28A75, 42B20, 52C10
url https://arxiv.org/abs/2208.07198