by

Ciro Santilli (@cirosantilli, 37)

Cross polytope

Examples: square, octahedron.

Take

(0, 0, 0, \dots, 0)

and flip one of 0's to

\pm 1

. Therefore has

2 \times D

Each edge E is linked to every other edge, except it's opposite -E.

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Classification of regular polytopes

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