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Step * of Lemma uiff_transitivity

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

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


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