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In geometry, the 5-cell is a four-dimensional object bounded by 5 tetrahedral cells. It is also known as a C5, pentachoron, pentatope, pentahedroid,〔Matila Ghyka, ''The geometry of Art and Life'' (1977), p.68〕 or tetrahedral pyramid. It is a 4-simplex, the simplest possible convex regular 4-polytope (four-dimensional analogue of a Platonic solid), and is analogous to the tetrahedron in three dimensions and the triangle in two dimensions. The pentachoron is a four dimensional pyramid with a tetrahedral base. The regular 5-cell is bounded by regular tetrahedra, and is one of the six regular convex 4-polytope, represented by Schläfli symbol . == Alternative names == * Pentachoron * 4-simplex * Pentatope * Pentahedroid (Henry Parker Manning) * Pen (Jonathan Bowers: for pentachoron)〔(Category 1: Regular Polychora )〕 * Hyperpyramid, tetrahedral pyramid 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「5-cell」の詳細全文を読む スポンサード リンク
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