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・ 7000 días juntos
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7-simplex
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7-simplex : ウィキペディア英語版
7-simplex

In 7-dimensional geometry, a 7-simplex is a self-dual regular 7-polytope. It has 8 vertices, 28 edges, 56 triangle faces, 70 tetrahedral cells, 56 5-cell 5-faces, 28 5-simplex 6-faces, and 8 6-simplex 7-faces. Its dihedral angle is cos−1(1/7), or approximately 81.79°.
== Alternate names ==
It can also be called an octaexon, or octa-7-tope, as an 8-facetted polytope in 7-dimensions. The name ''octaexon'' is derived from ''octa'' for eight facets in Greek and ''-ex'' for having six-dimensional facets, and ''-on''. Jonathan Bowers gives an octaexon the acronym oca.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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