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theorem proved term proof

orthogonalSystem_count

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formal statement (Lean)

  28theorem orthogonalSystem_count :
  29    Fintype.card OrthogonalCrystalSystem = 5 := by decide

proof body

Term-mode proof.

  30
  31/-- 7 systems total; 5 orthogonal + 2 oblique. -/

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