Deflating the Pentagon

  • Authors:
  • Erik D. Demaine;Martin L. Demaine;Thomas Fevens;Antonio Mesa;Michael Soss;Diane L. Souvaine;Perouz Taslakian;Godfried Toussaint

  • Affiliations:
  • Massachusetts Institute of Technology,;Massachusetts Institute of Technology,;Concordia University,;Universidad de La Habana,;McGill University,;Tufts University,;McGill University,;McGill University,

  • Venue:
  • Computational Geometry and Graph Theory
  • Year:
  • 2008

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Abstract

In this paper we consider deflations (inverse pocket flips) of n -gons for small n . We show that every pentagon can be deflated after finitely many deflations, and that any infinite deflation sequence of a pentagon results from deflating an induced quadrilateral on four of the vertices. We describe a family of hexagons that deflate infinitely for a specific deflation sequence, yet induce no infinitely deflating quadrilateral. We also review the known understanding of quadrilateral deflation.