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Step * of Lemma not_functionality_wrt_implies

∀[P,Q:ℙ].  {(¬P) ⇒ (¬Q)} supposing {P ⇐ Q}
BY
{ (Unfolds ``not guard`` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[P,Q:\mBbbP{}].    \{(\mneg{}P)  {}\mRightarrow{}  (\mneg{}Q)\}  supposing  \{P  \mLeftarrow{}{}  Q\}


By

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Latex:
(Unfolds  ``not  guard``  0  THEN  Auto)

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