Step 
*
5
 of Lemma 
assert-isname
.....wf..... 
1. L : Cname List
2. z : extd-nameset(L)
⊢ z ∈ nameset(L) ∈ Type
BY
 
{ (GenConcl ⌜z = b ∈ Base⌝⋅ THEN Auto) }
 
Latex: 
Latex:
.....wf.....  
1.  L  :  Cname  List
2.  z  :  extd-nameset(L)
\mvdash{}  z  \mmember{}  nameset(L)  \mmember{}  Type
 By 
Latex:
(GenConcl  \mkleeneopen{}z  =  b\mkleeneclose{}\mcdot{}  THEN  Auto)
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