Volume stability of plank covers
Abstract
We prove a longstanding conjecture of András Bezdek on the stability of plank covers of the planar disk D. If a sufficiently small disk ε D is removed, then every finite family of planks covering the resulting annulus can be rearranged to cover the whole disk. For the proof, we establish a stronger dimension-independent stability theorem. If K ⊂ ℝn is an origin-symmetric convex body for n ≥ 2, and the uncovered region lies in ε K and has volume v, then the excess overlap is at least c v/ε, where c>0 is an absolute constant. The proof introduces a pruning procedure and a flattening mechanism. Pruning peels away curvature through local removals whose cumulative effect is guaranteed to be substantial. Flattening trades straightness for bounded multiplicity and geometrically exposes the overlap that pays for each pruning step.
Related
BibTeX
@misc{bakaev2026volume,
title = {{Volume stability of plank covers}},
author = {Egor Bakaev and Amir Yehudayoff},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.30409},
eprint = {2609.30409},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.30409},
}
RIS
TY - UNPB
TI - Volume stability of plank covers
AU - Egor Bakaev
AU - Amir Yehudayoff
PY - 2026
DA - 2026/10/08
PB - arXiv
DO - 10.48550/arxiv.2609.30409
UR - https://arxiv.org/abs/2609.30409
AB - We prove a longstanding conjecture of András Bezdek on the stability of plank covers of the planar disk D. If a sufficiently small disk ε D is removed, then every finite family of planks covering the resulting annulus can be rearranged to cover the whole disk. For the proof, we establish a stronger dimension-independent stability theorem. If K ⊂ ℝ^n is an origin-symmetric convex body for n ≥ 2, and the uncovered region lies in ε K and has volume v, then the excess overlap is at least c v/ε, where c>0 is an absolute constant. The proof introduces a pruning procedure and a flattening mechanism. Pruning peels away curvature through local removals whose cumulative effect is guaranteed to be substantial. Flattening trades straightness for bounded multiplicity and geometrically exposes the overlap that pays for each pruning step.
ER -