lemma proved term proof

`cast_add_one`

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formal statement (Lean)

  67private lemma cast_add_one {n m : Nat} [NeZero n] [NeZero m] (h : n = m) (i : Fin n) :
  68    (i + 1).cast h = (i.cast h) + 1 := by

Term-mode proof.

  69  subst h
  70  simp
  71

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