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Step * of Lemma implies_antisymmetry

∀[P,Q:ℙ].  ((P ⇒ Q) ⇒ (Q ⇒ P) ⇒ (P ⇐⇒ Q))
BY
{ Auto }

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Latex:

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


By

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Latex:
Auto

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