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Rectification (geometry) : ウィキペディア英語版 | Rectification (geometry)
In Euclidean geometry, rectification or complete-truncation is the process of truncating a polytope by marking the midpoints of all its edges, and cutting off its vertices at those points. The resulting polytope will be bounded by vertex figure facets and the rectified facets of the original polytope. A rectification operator is given a letter-symbol ''r'', like ''r'' is a rectified cube, being a cuboctahedron. Conway polyhedron notation uses ambo for this operator. In graph theory this operation creates a medial graph. == Example of rectification as a final truncation to an edge == Rectification is the final point of a truncation process. For example on a cube this sequence shows four steps of a continuum of truncations between the regular and rectified form:
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