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Step * of Lemma union_functionality_wrt_uiff

∀[P1,P2,Q1,Q2:ℙ].  ({uiff(P1;P2)} ⇒ {uiff(Q1;Q2)} ⇒ {P1 + Q1 ⇐⇒ P2 + Q2})
BY
{ (Unfold `guard` 0 THEN Fold `or` 0 THEN Auto THEN ParallelLast 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{}  \{P1  +  Q1  \mLeftarrow{}{}\mRightarrow{}  P2  +  Q2\})


By

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Latex:
(Unfold  `guard`  0  THEN  Fold  `or`  0  THEN  Auto  THEN  ParallelLast  THEN  Auto)

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