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theorem proved term proof

alexander_duality_circle_linking

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formal statement (Lean)

 145theorem alexander_duality_circle_linking (D : ℕ) :
 146    SphereAdmitsCircleLinking D ↔ D = 3 := by

proof body

Term-mode proof.

 147  unfold SphereAdmitsCircleLinking
 148  rw [circle_reduced_cohomology_iff]
 149  constructor <;> intro h <;> omega
 150
 151/-! ## Derived Facts -/
 152
 153/-- D = 3 admits circle linking (forward direction). -/

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