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Step * 1 1 1 1 of Lemma classical-double-negation


1. P : ℙ@i'
2. P ∨ (¬P)
⊢ ¬¬P ⇐⇒ P
BY
{ (D -1 THEN Auto) }

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Latex:

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Latex:

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


By

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Latex:
(D  -1  THEN  Auto)

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