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Interior of sums of planar sets and curves

Published online by Cambridge University Press:  05 September 2018

KÁROLY SIMON  and
KRYSTAL TAYLOR
KÁROLY SIMON
Affiliation:
Budapest University of Technology and Economics, Department of Stochastics, Institute of Mathematics, and MTA-BME Stochastics Research Group, 1521 Budapest, P.O. Box 91, Hungary e-mail: [email protected]
KRYSTAL TAYLOR
Affiliation:
Department of Mathematics, The Ohio State, Columbus, OH, 231 W. 18th Ave., MW 706 Columbus, OH 43210 e-mail: [email protected]
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Abstract

Recently, considerable attention has been given to the study of the arithmetic sum of two planar sets. We focus on understanding the interior (A + Γ)°, when Γ is a piecewise ${\mathcal C}^2$ curve and A ⊂ ℝ2. To begin, we give an example of a very large (full-measure, dense, Gδ) set A such that (A + S1)° = ∅, where S1 denotes the unit circle. This suggests that merely the size of A does not guarantee that (A + S1)° ≠ ∅. If, however, we assume that A is a kind of generalised product of two reasonably large sets, then (A + Γ)° ≠ ∅ whenever Γ has non-vanishing curvature. As a byproduct of our method, we prove that the pinned distance set of C := Cγ × Cγ, γ ⩾ 1/3, pinned at any point of C has non-empty interior, where Cγ (see (1.1)) is the middle 1 − 2γ Cantor set (including the usual middle-third Cantor set, C1/3). Our proof for the middle-third Cantor set requires a separate method. We also prove that C + S1 has non-empty interior.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 168 , Issue 1 , January 2020 , pp. 119 - 148
Copyright
Copyright © Cambridge Philosophical Society 2018 

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Footnotes

† This work came out of a collaboration that started at ICERM at Brown University, Rhode Island. This research was supported by the Mathematics Research Institute of the Ohio State University.

‡

Partially supported by the grant OTKA 123782, by MTA-BME Stochastics Research Group and by ICERM, by supporting his participation on one of their a semester programs in 2016.

References

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