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Step * 1 1 1 2 of Lemma notnot_P_or_notP


1. [P] : 
2. (P  (P))@i
3. False
 False
BY
{ NthHyp 3 }

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Latex:



1.  [P]  :  \mBbbP{}
2.  \mneg{}(P  \mvee{}  (\mneg{}P))@i
3.  False
\mvdash{}  False


By

NthHyp  3

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