Classification of spherical tilings by congruent quadrangles over pseudo-double wheels (II)—the isohedral case

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Abstract

We classify all edge-to-edge spherical isohedral 4-gonal tilings such that the skeletons are pseudo-double wheels. For this, we characterize these spherical tilings by a quadratic equation for the cosine of an edge-length. By the classification, we see: There are indeed two non-congruent, edge-to-edge spherical isohedral 4-gonal tilings such that the skeletons are the same pseudo-double wheel and the cyclic list of the four inner angles of the tiles are the same. This contrasts with that every edge-to-edge spherical tiling by congruent 3-gons is determined by the skeleton and the inner angles of the skeleton. We show that for a particular spherical isohedral tiling over the pseudodouble wheel of twelve faces, the quadratic equation has a double solution and the copies of the tile also organize a spherical non-isohedral tiling over the same skeleton.

Original languageEnglish
Pages (from-to)1-34
Number of pages34
JournalHiroshima Mathematical Journal
Volume49
Issue number1
DOIs
Publication statusPublished - 2019 Mar

Keywords

  • Graph
  • Skeleton
  • Spherical monohedral tiling
  • Spherical quadrangle
  • Spherical trigonometry
  • Symmetry
  • Tile-transitive

ASJC Scopus subject areas

  • Analysis
  • Algebra and Number Theory
  • Geometry and Topology

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