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Step * 1 1 1 of Lemma not-not-excluded-middle-quot-true


1. P : ℙ
2. P ∨ (¬P)
⊢ ⇃(P ∨ (¬P))
BY
{ (BLemma `trivial-quotient-true` THEN Auto) }

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Latex:

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Latex:

1.  P  :  \mBbbP{}
2.  P  \mvee{}  (\mneg{}P)
\mvdash{}  \00D9(P  \mvee{}  (\mneg{}P))


By

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Latex:
(BLemma  `trivial-quotient-true`  THEN  Auto)

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