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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. -/

depends on (2)

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