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Step * of Lemma comb_for_choose_wf

λn,i,z. choose(n;i) ∈ n:ℕ ⟶ i:{0...n} ⟶ (↓True) ⟶ ℕ
BY
{ ProveOpCombTyping `choose_wf` }

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Latex:

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Latex:
\mlambda{}n,i,z.  choose(n;i)  \mmember{}  n:\mBbbN{}  {}\mrightarrow{}  i:\{0...n\}  {}\mrightarrow{}  (\mdownarrow{}True)  {}\mrightarrow{}  \mBbbN{}


By

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Latex:
ProveOpCombTyping  `choose\_wf`

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