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def definition def or abbrev

last

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formal statement (Lean)

  45def last : M.U := by

proof body

Definition body.

  46  have hlt : ch.n < ch.n + 1 := Nat.lt_succ_self _
  47  exact ch.f ⟨ch.n, hlt⟩
  48end Chain
  49

used by (30)

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