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Step * 4 of Lemma assert-isname

.....wf..... 
1. L : Cname List
2. z : extd-nameset(L)
3. z ∈ nameset(L)
4. ↑isname(z)
⊢ isname(z) ∈ 𝔹
BY
{ Auto }

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Latex:

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Latex:
.....wf..... 
1.  L  :  Cname  List
2.  z  :  extd-nameset(L)
3.  z  \mmember{}  nameset(L)
4.  \muparrow{}isname(z)
\mvdash{}  isname(z)  \mmember{}  \mBbbB{}


By

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Latex:
Auto

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