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Step * of Lemma iff_preserves_decidability

∀[A,B:ℙ].  (Dec(A) ⇒ (A ⇐⇒ B) ⇒ Dec(B))
BY
{ ((Unfold `decidable` 0 THEN Auto) THEN SplitOrHyps THEN Auto) }

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Latex:

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Latex:
\mforall{}[A,B:\mBbbP{}].    (Dec(A)  {}\mRightarrow{}  (A  \mLeftarrow{}{}\mRightarrow{}  B)  {}\mRightarrow{}  Dec(B))


By

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Latex:
((Unfold  `decidable`  0  THEN  Auto)  THEN  SplitOrHyps  THEN  Auto)

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