りったい 立体
1. Catalan solid; Archimedean dualMathematics
Wikipedia definition
2. Catalan solidIn mathematics, a Catalan solid, or Archimedean dual, is a dual polyhedron to an Archimedean solid. The Catalan solids are named for the Belgian mathematician, Eugène Catalan, who first described them in 1865. The Catalan solids are all convex. They are face-transitive but not vertex-transitive. This is because the dual Archimedean solids are vertex-transitive and not face-transitive. Note that unlike Platonic solids and Archimedean solids, the faces of Catalan solids are not regular polygons.
Read “Catalan solid” on English Wikipedia
Read “カタランの立体” on Japanese Wikipedia
Read “Catalan solid” on DBpedia


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