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theorem proved term proof

three_colors_forced

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formal statement (Lean)

  49theorem three_colors_forced :
  50    N_colors DimensionForcing.D_physical = 3 := by

proof body

Term-mode proof.

  51  unfold N_colors DimensionForcing.D_physical face_pairs
  52  rfl
  53
  54/-! ## Structural Theorems -/
  55
  56/-- N_colors D = D (by definition of face_pairs). -/

depends on (9)

Lean names referenced from this declaration's body.