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Step * of Lemma uiff_inversion

∀[P,Q:ℙ].  (uiff(Q;P) ⇒ uiff(P;Q))
BY
{ (UnivCD THENA Auto) }

1
1. [P] : ℙ
2. [Q] : ℙ
3. uiff(Q;P)@i
⊢ uiff(P;Q)

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Latex:

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


By

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Latex:
(UnivCD  THENA  Auto)

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