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Step * of Lemma not_over_implies

∀[A,B:ℙ].  (¬(A ⇒ B) ⇐⇒ (¬¬A) ∧ (¬B))
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Latex:
\mforall{}[A,B:\mBbbP{}].    (\mneg{}(A  {}\mRightarrow{}  B)  \mLeftarrow{}{}\mRightarrow{}  (\mneg{}\mneg{}A)  \mwedge{}  (\mneg{}B))


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