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Step * of Lemma classical-double-negation

∀P:ℙ. {¬¬P ⇐⇒ P}
BY
{ Auto }

1
1. P : ℙ@i'
⊢ {¬¬P ⇐⇒ P}

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Latex:

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Latex:
\mforall{}P:\mBbbP{}.  \{\mneg{}\mneg{}P  \mLeftarrow{}{}\mRightarrow{}  P\}


By

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Latex:
Auto

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