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Uniform 9-polytope : ウィキペディア英語版 | Uniform 9-polytope
In nine-dimensional geometry, a nine-dimensional polytope or 9-polytope is a polytope contained by 8-polytope facets. Each 7-polytope ridge being shared by exactly two 8-polytope facets. A uniform 9-polytope is one which is vertex-transitive, and constructed from uniform 8-polytope facets. == Regular 9-polytopes ==
Regular 9-polytopes can be represented by the Schläfli symbol , with w 8-polytope facets around each peak. There are exactly three such convex regular 9-polytopes: # - 9-simplex # - 9-cube # - 9-orthoplex There are no nonconvex regular 9-polytopes.
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