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DOI: 10.4230/LIPIcs.SoCG.2020.41
Combinatorial Properties of Self-Overlapping Curves and Interior Boundaries

Authors: Parker Evans, Brittany Terese Fasy, and Carola Wenk

Published in: LIPIcs, Volume 164, 36th International Symposium on Computational Geometry (SoCG 2020)

Abstract
We study the interplay between the recently-defined concept of minimum homotopy area and the classical topic of self-overlapping curves. The latter are plane curves that are the image of the boundary of an immersed disk. Our first contribution is to prove new sufficient combinatorial conditions for a curve to be self-overlapping. We show that a curve γ with Whitney index 1 and without any self-overlapping subcurves is self-overlapping. As a corollary, we obtain sufficient conditions for self-overlapping ness solely in terms of the Whitney index of the curve and its subcurves. These results follow from our second contribution, which shows that any plane curve γ, modulo a basepoint condition, is transformed into an interior boundary by wrapping around γ with Jordan curves. In fact, we show that n+1 wraps suffice, where γ has n vertices. Our third contribution is to prove the equivalence of various definitions of self-overlapping curves and interior boundaries, often implicit in the literature. We also introduce and characterize zero-obstinance curves, a further generalization of interior boundaries defined by optimality in minimum homotopy area.
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Parker Evans, Brittany Terese Fasy, and Carola Wenk. Combinatorial Properties of Self-Overlapping Curves and Interior Boundaries. In 36th International Symposium on Computational Geometry (SoCG 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 164, pp. 41:1-41:17, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{evans_et_al:LIPIcs.SoCG.2020.41,
  author =	{Evans, Parker and Fasy, Brittany Terese and Wenk, Carola},
  title =	{{Combinatorial Properties of Self-Overlapping Curves and Interior Boundaries}},
  booktitle =	{36th International Symposium on Computational Geometry (SoCG 2020)},
  pages =	{41:1--41:17},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-143-6},
  ISSN =	{1868-8969},
  year =	{2020},
  volume =	{164},
  editor =	{Cabello, Sergio and Chen, Danny Z.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.SoCG.2020.41},
  URN =		{urn:nbn:de:0030-drops-121993},
  doi =		{10.4230/LIPIcs.SoCG.2020.41},
  annote =	{Keywords: Self-overlapping curves, interior boundaries, minimum homotopy area, immersion}
}
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