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Step * of Lemma and_functionality_wrt_uiff

∀[P1,P2,Q1,Q2:ℙ].  ({uiff(P1;P2)} ⇒ {uiff(Q1;Q2)} ⇒ {uiff(P1 ∧ Q1;P2 ∧ Q2)})
BY
{ (Unfold `guard` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[P1,P2,Q1,Q2:\mBbbP{}].    (\{uiff(P1;P2)\}  {}\mRightarrow{}  \{uiff(Q1;Q2)\}  {}\mRightarrow{}  \{uiff(P1  \mwedge{}  Q1;P2  \mwedge{}  Q2)\})


By

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Latex:
(Unfold  `guard`  0  THEN  Auto)

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