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Step * of Lemma squash_functionality_wrt_uiff

∀[P,Q:ℙ].  ({P ⇐⇒ Q} ⇒ {uiff(↓P;↓Q)})
BY
{ ((Unfold `guard` 0 THEN Auto) THEN D 0 THEN BackThruSomeHyp THEN Auto) }

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Latex:

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


By

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Latex:
((Unfold  `guard`  0  THEN  Auto)  THEN  D  0  THEN  BackThruSomeHyp  THEN  Auto)

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