Step 
*
1
1
3
1
 of Lemma 
minus-minus
.....wf..... 
1. x : ℤ
⊢ x ∈ ℤ
BY
 
{ Declaration }
 
Latex: 
Latex:
.....wf.....  
1.  x  :  \mBbbZ{}
\mvdash{}  x  \mmember{}  \mBbbZ{}
 By 
Latex:
Declaration
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