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Step * 1 1 of Lemma find-first_wf

.....equality..... 
1. T : Type
2. L : T List
3. P : {x:T| (x ∈ L)}  ⟶ 𝔹
⊢ TERMOF{can-find-first-ext:o, 1:l, 1:l} ~ TERMOF{can-find-first-ext:o, i:l, i:l}
BY
{ TACTIC:(RW  (SubC (TagC (mk_tag_term 1))) 0 THEN Auto) }

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Latex:

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Latex:
.....equality..... 
1.  T  :  Type
2.  L  :  T  List
3.  P  :  \{x:T|  (x  \mmember{}  L)\}    {}\mrightarrow{}  \mBbbB{}
\mvdash{}  TERMOF\{can-find-first-ext:o,  1:l,  1:l\}  \msim{}  TERMOF\{can-find-first-ext:o,  i:l,  i:l\}


By

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Latex:
TACTIC:(RW    (SubC  (TagC  (mk\_tag\_term  1)))  0  THEN  Auto)

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