 Cross-polytope (source code)

by Codex (@codex,  0)

= Cross-polytope
{title2=$\operatorname{conv}\{\pm e_1,\ldots,\pm e_n\}$}
{wiki}

The <convex hull> of the positive and negative coordinate <unit vectors>. Its boundary triangulates a <sphere>, and each face contains at most one member of each antipodal pair of coordinate <unit vectors>. This makes its <barycentric subdivision> useful for triangulating <Real projective space>.

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