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Main Authors: Máthé, András, Noel, Jonathan A., Pikhurko, Oleg
Format: Preprint
Published: 2022
Subjects:
Online Access:https://arxiv.org/abs/2202.01412
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author Máthé, András
Noel, Jonathan A.
Pikhurko, Oleg
author_facet Máthé, András
Noel, Jonathan A.
Pikhurko, Oleg
contents Tarski's Circle Squaring Problem from 1925 asks whether it is possible to partition a disk in the plane into finitely many pieces and reassemble them via isometries to yield a partition of a square of the same area. It was finally resolved by Laczkovich in 1990 in the affirmative. Recently, several new proofs have emerged which achieve circle squaring with better structured pieces: namely, pieces which are Lebesgue measurable and have the property of Baire (Grabowski-Máthé-Pikhurko) or even are Borel (Marks-Unger). In this paper, we show that circle squaring is possible with Borel pieces of positive Lebesgue measure whose boundaries have upper Minkowski dimension less than 2 (in particular, each piece is Jordan measurable). We also improve the Borel complexity of the pieces: namely, we show that each piece can be taken to be a Boolean combination of $F_σ$ sets. This is a consequence of our more general result that applies to any two bounded subsets of $R^k$, $k\ge 1$, of equal positive measure whose boundaries have upper Minkowski dimension smaller than $k$.
format Preprint
id arxiv_https___arxiv_org_abs_2202_01412
institution arXiv
publishDate 2022
record_format arxiv
spellingShingle Circle Squaring with Pieces of Small Boundary and Low Borel Complexity
Máthé, András
Noel, Jonathan A.
Pikhurko, Oleg
Metric Geometry
Combinatorics
Tarski's Circle Squaring Problem from 1925 asks whether it is possible to partition a disk in the plane into finitely many pieces and reassemble them via isometries to yield a partition of a square of the same area. It was finally resolved by Laczkovich in 1990 in the affirmative. Recently, several new proofs have emerged which achieve circle squaring with better structured pieces: namely, pieces which are Lebesgue measurable and have the property of Baire (Grabowski-Máthé-Pikhurko) or even are Borel (Marks-Unger). In this paper, we show that circle squaring is possible with Borel pieces of positive Lebesgue measure whose boundaries have upper Minkowski dimension less than 2 (in particular, each piece is Jordan measurable). We also improve the Borel complexity of the pieces: namely, we show that each piece can be taken to be a Boolean combination of $F_σ$ sets. This is a consequence of our more general result that applies to any two bounded subsets of $R^k$, $k\ge 1$, of equal positive measure whose boundaries have upper Minkowski dimension smaller than $k$.
title Circle Squaring with Pieces of Small Boundary and Low Borel Complexity
topic Metric Geometry
Combinatorics
url https://arxiv.org/abs/2202.01412