Uryson width and volume

Abstract

We give a short proof of a theorem of Guth relating volume of balls and Uryson width. The same approach applies to Hausdorff content implying a recent result of Liokumovich-Lishak-Nabutovsky-Rotman. We show also that for any $C>0$ there is a Riemannian metric $g$ on a 3-sphere such that $\text{vol}(S^3,g)=1$ and for any map $f:S^3\to {\mathbb{R}}^2$ there is some $x\in {\mathbb{R}}^2$ for which $\text{diam}(f^{-1}(x))>C$-answering a question of Guth.

Final version after referee's comments

References in corpus (2)

• Diastolic and isoperimetric inequalities on surfaces
• Linear bounds for constants in Gromov's systolic inequality and related results