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Step * 1 1 of Lemma not-not-p-or-not-p-example


1. P : ℙ
2. ¬(P ∨ (¬P))
3. ¬(P ∨ (¬P))
⊢ False
BY
{ D -1 }

1
1. P : ℙ
2. ¬(P ∨ (¬P))
⊢ P ∨ (¬P)

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Latex:

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Latex:

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


By

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Latex:
D  -1

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