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Step * of Lemma iff_weakening_uiff

∀[P,Q:ℙ].  (uiff(P;Q) ⇒ (P ⇐⇒ Q))
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Latex:

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Latex:
\mforall{}[P,Q:\mBbbP{}].    (uiff(P;Q)  {}\mRightarrow{}  (P  \mLeftarrow{}{}\mRightarrow{}  Q))


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