Step
*
of Lemma
non-uniform-triple-neg
∀A:ℙ. (¬¬¬A 
⇐⇒
 ¬A)
BY
{ Auto }
Latex:
Latex:
\mforall{}A:\mBbbP{}.  (\mneg{}\mneg{}\mneg{}A  \mLeftarrow{}{}\mRightarrow{}  \mneg{}A)
By
Latex:
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