theorem
proved
term proof
linking_iff_D3
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formal statement (Lean)
122theorem linking_iff_D3 (D : ℕ) :
123 0 < independent_charge_count D ↔ D = 3 := by
proof body
Term-mode proof.
124 simp [independent_charge_count]; split <;> omega
125
126/-- Charge count = face pairs = colors = generations. -/