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theorem proved term proof

cube_uniqueness

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formal statement (Lean)

 136theorem cube_uniqueness :
 137    ∀ D : ℕ, (linkingNumber D ≠ 0) ↔ D = 3 := by

proof body

Term-mode proof.

 138  intro D
 139  constructor
 140  · intro h
 141    unfold linkingNumber at h
 142    split_ifs at h with hD
 143    · exact hD
 144    · contradiction
 145  · intro h
 146    rw [h]
 147    unfold linkingNumber
 148    simp
 149
 150/-! ## 8-Tick Uniqueness -/
 151
 152/-- A Gray code cycle of length T on D dimensions. -/

depends on (15)

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