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Step * of Lemma comb_for_fib_wf

λn,z. fib(n) ∈ n:ℕ ⟶ (↓True) ⟶ ℕ
BY
{ (ProveOpCombinatorTyping Auto) `fib_wf` }

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Latex:

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Latex:
\mlambda{}n,z.  fib(n)  \mmember{}  n:\mBbbN{}  {}\mrightarrow{}  (\mdownarrow{}True)  {}\mrightarrow{}  \mBbbN{}


By

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Latex:
(ProveOpCombinatorTyping  Auto)  `fib\_wf`

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