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Step * 1 of Lemma bl-rev-exists_wf


1. [T] : Type
2. [L] : T List
3. [P] : {x:T| (x ∈ L)}  ⟶ 𝔹
4. (∃x∈rev(L).P[x])_b ~ (∃x∈L.P[x])_b
⊢ (∃x∈L.P[x])_b ∈ 𝔹
BY
{ Auto }

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Latex:

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Latex:

1.  [T]  :  Type
2.  [L]  :  T  List
3.  [P]  :  \{x:T|  (x  \mmember{}  L)\}    {}\mrightarrow{}  \mBbbB{}
4.  (\mexists{}x\mmember{}rev(L).P[x])\_b  \msim{}  (\mexists{}x\mmember{}L.P[x])\_b
\mvdash{}  (\mexists{}x\mmember{}L.P[x])\_b  \mmember{}  \mBbbB{}


By

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Latex:
Auto

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