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def definition def or abbrev

regular_tet_dihedral

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formal statement (Lean)

  79def regular_tet_dihedral : DihedralAngleData :=

proof body

Definition body.

  80  { cosine := 1 / 3
  81  , cosine_lb := by norm_num
  82  , cosine_ub := by norm_num
  83  }
  84
  85/-- The regular-tetrahedron dihedral angle is `arccos(1/3) ≈ 70.53°`. -/

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