103 research outputs found

    Spherical Tiling by 12 Congruent Pentagons

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    The tilings of the 2-dimensional sphere by congruent triangles have been extensively studied, and the edge-to-edge tilings have been completely classified. However, not much is known about the tilings by other congruent polygons. In this paper, we classify the simplest case, which is the edge-to-edge tilings of the 2-dimensional sphere by 12 congruent pentagons. We find one major class allowing two independent continuous parameters and four classes of isolated examples. The classification is done by first separately classifying the combinatorial, edge length, and angle aspects, and then combining the respective classifications together.Comment: 53 pages, 40 figures, spherical geometr

    Tilings of the Sphere by Edge Congruent Pentagons

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    We study edge-to-edge tilings of the sphere by edge congruent pentagons, under the assumption that there are tiles with all vertices having degree 3. We develop the technique of neighborhood tilings and apply the technique to completely classify edge congruent earth map tilings.Comment: 36 pages, 34 figure

    Angle Combinations in Spherical Tilings by Congruent Pentagons

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    We develop a systematic method for computing the angle combinations in spherical tilings by angle congruent pentagons, and study whether such combinations can be realized by actual angle or geometrically congruent tilings. We get major families of angle or geometrically congruent tilings related to the platonic solids.Comment: 58 pages, 5 figure

    Spherical tilings by congruent quadrangles : forbidden cases and substructures

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    In this article we show the non-existence of a class of spherical tilings by congruent quadrangles. We also prove several forbidden substructures for spherical tilings by congruent quadrangles. These are results that will help to complete of the classification of spherical tilings by congruent quadrangles
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