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<p>Explicit lower bounds for the length of the shortest opaque set for the unit disc and the unit square in the Euclidean plane are derived. The results are based on an explicit application of the general method of Kawamura, Moriyama, Otachi and Pach [<CitationRef CitationID="CR9">9</CitationRef>]. Employing a recent observation by Steinerberger on the possible orientations of straight barriers with length close to Jones’ bound, we improve the bound in [<CitationRef CitationID="CR9">9</CitationRef>] by more than a factor 3. The bound for barriers of the unit disc is new and based on the idea that the free parameters in the general method from [<CitationRef CitationID="CR9">9</CitationRef>] can be optimized due to the strong symmetry properties of the disc. Our approach illustrates both the power and the limitations of the method.</p>

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Explicit lower bounds for opaque sets of unit square and unit disc

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月1日

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  • Markus Kiderlen,
  • Florian Pausinger

摘要

Explicit lower bounds for the length of the shortest opaque set for the unit disc and the unit square in the Euclidean plane are derived. The results are based on an explicit application of the general method of Kawamura, Moriyama, Otachi and Pach [9]. Employing a recent observation by Steinerberger on the possible orientations of straight barriers with length close to Jones’ bound, we improve the bound in [9] by more than a factor 3. The bound for barriers of the unit disc is new and based on the idea that the free parameters in the general method from [9] can be optimized due to the strong symmetry properties of the disc. Our approach illustrates both the power and the limitations of the method.