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theorem proved term proof

D4_no_linking

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formal statement (Lean)

 307theorem D4_no_linking : ¬SupportsNontrivialLinking 4 :=

proof body

Term-mode proof.

 308  fun h => absurd (linking_requires_D3 4 h) (by norm_num)
 309
 310/-- D ≥ 4 does not support linking (Alexander duality: linking group trivial
 311    for D ≥ 4 since H̃^{D-2}(S¹) = 0 when D-2 ≥ 2). -/

depends on (6)

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