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Step * 1 1 1 1 1 of Lemma classical-excluded-middle


1. P : ℙ@i'
2. P ∨ (¬P) ∈ ℙ
3. ¬(P ∨ (¬P))@i
⊢ ¬P
BY
{ (D 0 THEN Auto) }

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Latex:

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Latex:

1.  P  :  \mBbbP{}@i'
2.  P  \mvee{}  (\mneg{}P)  \mmember{}  \mBbbP{}
3.  \mneg{}(P  \mvee{}  (\mneg{}P))@i
\mvdash{}  \mneg{}P


By

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Latex:
(D  0  THEN  Auto)

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