TAILIEUCHUNG - Báo cáo toán học: "Tilings of the sphere with right triangles III: the asymptotically obtuse families"

Tuyển tập các báo cáo nghiên cứu khoa học về toán học trên tạp chí toán học quốc tế đề tài: Tilings of the sphere with right triangles III: the asymptotically obtuse families. | Tilings of the sphere with right triangles III the asymptotically obtuse families Robert J. MacG. Dawson Department of Mathematics and Computing Science Saint Mary s University Halifax Nova Scotia Canada Blair Doyle HB Studios Multimedia Ltd. Lunenburg Nova Scotia Canada B0J 2C0 Submitted Feb 7 2007 Accepted Jun 28 2007 Published Jul 5 2007 Mathematics Subject Classihcation 05B45 Abstract Sommerville and Davies classihed the spherical triangles that can tile the sphere in an edge-to-edge fashion. However if the edge-to-edge restriction is relaxed there are other such triangles here we continue the classihcation of right triangles with this property begun in our earlier papers. We consider six families of triangles classihed as asymptotically obtuse and show that they contain two non-edge-to-edge tiles one with angles of 90 105 and 45 believed to be previously unknown. Keywords spherical right triangle monohedral tiling non-edge-to-edge nonnormal asymptotically obtuse Supported by a grant from NSERC y Supported in part by an NSERC USRA THE ELECTRONIC JOURNAL OF COMBINATORICS 14 2007 R48 1 1 Introduction A tiling is called monohedral or homohedral if all tiles are congruent and edge-to-edge or normal if two tiles that intersect do so in a single vertex or an entire edge. In 1923 . Sommerville 8 classified the edge-to-edge monohedral tilings of the sphere with isosceles triangles and those with scalene triangles in which the angles meeting at any one vertex are congruent. . Davies 1 completed the classification of edge-to-edge monohedral tilings by triangles in 1967 apparently without knowledge of Sommerville s work allowing any combination of angles at a vertex. Davies work omitted many details these were filled in recently by Ueno and Agaoka 9 . Non-edge-to-edge tilings were apparently first considered in 2 where a complete classification of isosceles spherical triangles that tile the sphere was given. In 3 it was shown that with one exception every triangle

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