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theorem proved term proof

D2_no_linking

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formal statement (Lean)

 302theorem D2_no_linking : ¬SupportsNontrivialLinking 2 :=

proof body

Term-mode proof.

 303  fun h => absurd (linking_requires_D3 2 h) (by norm_num)
 304
 305/-- D = 4 does not support linking (codimension ≥ 2 — curves unlink by
 306    general position, linking group H̃^2(S¹) = 0). -/

depends on (5)

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