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def definition def or abbrev

last

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formal statement (Lean)

  24def last : M.U := by

proof body

Definition body.

  25  have hlt : ch.n < ch.n + 1 := Nat.lt_succ_self _
  26  exact ch.f ⟨ch.n, hlt⟩
  27
  28end Chain
  29

used by (30)

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