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arXiv · 1810.00984

Dimensions of triangle sets

Han Yu
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Abstract

In this paper, we discuss some dimension results for triangle sets of compact sets in $\mathbb{R}^2$. In particular, we prove that for any compact set $F$ in $\mathbb{R}^2$, the triangle set $\Delta(F)$ satisfies \[ \dim_{\mathrm{A}} \Delta(F)\geq \frac{3}{2}\dim_{\mathrm{A}} F. \] If $\dim_{\mathrm{A}} F>1$ then we have \[ \dim_{\mathrm{A}} \Delta(F)\geq 1+\dim_{\mathrm{A}} F. \] If $\dim_{\mathrm{A}} F>4/3$ then we have the following better bound, \[ \dim_{\mathrm{A}} \Delta(F)\geq \min\left\{\frac{5}{2}\dim_{\mathrm{A}} F-1,3\right\}. \] Moreover, if $F$ satisfies a mild separation condition then the above result holds also for the box dimensions, namely, \[ \underline{\dim_{\mathrm{B}}} F\geq \frac{3}{2}\underline{\dim_{\mathrm{B}}} \Delta(F) \text{ and }\overline{\dim_{\mathrm{B}}} F\geq \frac{3}{2}\overline{\dim_{\mathrm{B}}} \Delta(F). \]

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Han Yu. 2018-10-01. Dimensions of triangle sets. https://doi.org/10.1112/s0025579318000505

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