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Step * of Lemma decidable__not

∀[P:ℙ]. (Dec(P) ⇒ Dec(¬P))
BY
{ (Unfold `not` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[P:\mBbbP{}].  (Dec(P)  {}\mRightarrow{}  Dec(\mneg{}P))


By

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Latex:
(Unfold  `not`  0  THEN  Auto)

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