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theorem proved term proof

empty_is_closed

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formal statement (Lean)

 351theorem empty_is_closed {D : ℕ} : is_closed ([] : LatticePath D) :=

proof body

Term-mode proof.

 352  fun k => winding_empty k
 353
 354/-- A cancelling pair is a closed path. -/

depends on (10)

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