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Step * of Lemma comb_for_ndiff_wf

λa,b,z. (a -- b) ∈ a:ℤ ⟶ b:ℤ ⟶ (↓True) ⟶ ℤ
BY
{ (ProveOpCombinatorTyping Auto) `ndiff_wf` }

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Latex:

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Latex:
\mlambda{}a,b,z.  (a  --  b)  \mmember{}  a:\mBbbZ{}  {}\mrightarrow{}  b:\mBbbZ{}  {}\mrightarrow{}  (\mdownarrow{}True)  {}\mrightarrow{}  \mBbbZ{}


By

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Latex:
(ProveOpCombinatorTyping  Auto)  `ndiff\_wf`

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