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Step * of Lemma and_functionality_wrt_uimplies

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

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Latex:

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


By

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Latex:
(Unfold  `guard`  0  THEN  Auto)

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