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Step * of Lemma not_over_or_a

∀[A,B:ℙ].  uiff(¬(A ∨ B);{(¬A) ∧ (¬B)})
BY
{ (Unfold `guard` 0 THEN Lemma `not_over_or`) }

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Latex:

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Latex:
\mforall{}[A,B:\mBbbP{}].    uiff(\mneg{}(A  \mvee{}  B);\{(\mneg{}A)  \mwedge{}  (\mneg{}B)\})


By

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Latex:
(Unfold  `guard`  0  THEN  Lemma  `not\_over\_or`)

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