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Step * of Lemma comb_for_mset_sum_wf

λs,a,b,z. (a + b) ∈ s:DSet ⟶ a:MSet{s} ⟶ b:MSet{s} ⟶ (↓True) ⟶ MSet{s}
BY
{ ProveOpCombTyping `mset_sum_wf` }

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Latex:

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Latex:
\mlambda{}s,a,b,z.  (a  +  b)  \mmember{}  s:DSet  {}\mrightarrow{}  a:MSet\{s\}  {}\mrightarrow{}  b:MSet\{s\}  {}\mrightarrow{}  (\mdownarrow{}True)  {}\mrightarrow{}  MSet\{s\}


By

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Latex:
ProveOpCombTyping  `mset\_sum\_wf`

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