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Step * of Lemma decidable__or

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

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Latex:

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


By

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

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