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def definition def or abbrev

face_pairs

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formal statement (Lean)

  93def face_pairs (D : ℕ) : ℕ := D * (D - 1) / 2

proof body

Definition body.

  94
  95/-- Order of the hyperoctahedral group B_D = Aut(Q_D): signed
  96    permutations of D coordinate axes. |B_D| = 2^D × D!. -/

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