Step 
*
 of Lemma 
comb_for_int_upper_wf
λn,z. {n...} ∈ n:ℤ ⟶ (↓True) ⟶ 𝕌1
BY
 
{ (ProveOpCombinatorTyping Auto) `int_upper_wf` }
 
Latex: 
Latex:
\mlambda{}n,z.  \{n...\}  \mmember{}  n:\mBbbZ{}  {}\mrightarrow{}  (\mdownarrow{}True)  {}\mrightarrow{}  \mBbbU{}\msubone{}
 By 
Latex:
(ProveOpCombinatorTyping  Auto)  `int\_upper\_wf`
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