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theorem proved term proof

D3_has_linking

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formal statement (Lean)

 287theorem D3_has_linking : SupportsNontrivialLinking 3 :=

proof body

Term-mode proof.

 288  (alexander_duality_circle_linking 3).mpr rfl
 289
 290/-- **T8 PRIMARY THEOREM**: Linking requires D = 3.
 291    Proof: Alexander duality — no reference to 8-tick or gap-45. -/

used by (2)

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depends on (9)

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