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Step * of Lemma not-not-excluded-middle-quot-true

∀P:ℙ. (¬¬⇃(P ∨ (¬P)))
BY
{ RepeatFor 2 ((D 0 THENA Auto)) }

1
1. P : ℙ
2. ¬⇃(P ∨ (¬P))
⊢ False

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Latex:

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Latex:
\mforall{}P:\mBbbP{}.  (\mneg{}\mneg{}\00D9(P  \mvee{}  (\mneg{}P)))


By

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Latex:
RepeatFor  2  ((D  0  THENA  Auto))

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