Abstract
We use homological and geometrical methods to study the problem of determining when a convex disk is trapped by four lines.
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Dedicated to Professor Jorge Urrutia.
L. Montejano acknowledges thankfully support of CONACYT, project 166306 and PAPIIT-UNAM project IN112614. T. Zamfirescu gratefully acknowledges financial supports by the High-end Foreign Experts Recruitment Program of People’s Republic of China. His work was also partly supported by a grant of the Roumanian National Authority for Scientific Research, CNCS – UEFISCDI, project number PN-II-ID-PCE-2011-3-0533.
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Montejano, L., Zamfirescu, T. When is a Disk Trapped by Four Lines?. Graphs and Combinatorics 31, 467–476 (2015). https://doi.org/10.1007/s00373-015-1549-y
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DOI: https://doi.org/10.1007/s00373-015-1549-y