Step * of Lemma implies_functionality_wrt_implies

[P1,P2,Q1,Q2:ℙ].  ({P1  P2}  {Q1  Q2}  {(P1  Q1)  P2  Q2})
BY
(Unfold `guard` THEN Auto) }


Latex:


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


By


Latex:
(Unfold  `guard`  0  THEN  Auto)




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