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Step * of Lemma comb_for_gcd_wf

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

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Latex:

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


By

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Latex:
(ProveOpCombinatorTyping  Auto)  `gcd\_wf`

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