Step
*
1
1
1
1
1
of Lemma
logic5
.....antecedent.....
 
1.
 
[P]
 
:
 
2.
 
P@i
 
P
BY
{
 
NthHyp
 
2
 
}
.....antecedent..... 
1.  [P]  :  \mBbbP{}
2.  P@i
\mvdash{}  P
By
NthHyp  2
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