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theorem proved term proof

alpha_s_pred_eq_two_over_W

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formal statement (Lean)

  52theorem alpha_s_pred_eq_two_over_W :
  53    alpha_s_pred = 2 / (wallpaper_groups : ℝ) := by

proof body

Term-mode proof.

  54  simp only [alpha_s_pred, alpha_s_geom, wallpaper_groups]
  55  norm_num
  56
  57/-- Exact value of 2/17 as real. -/

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