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Step * 2 of Lemma no-uniform-double-negation-elim


1. ∀[P:ℙ]. ((¬¬P) ⇒ P)@i'
2. ∀[P:ℙ]. (P ∨ (¬P))
⊢ False
BY
{ (InstLemma `no-uniform-xmiddle` [] THEN Auto) }

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Latex:

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Latex:

1.  \mforall{}[P:\mBbbP{}].  ((\mneg{}\mneg{}P)  {}\mRightarrow{}  P)@i'
2.  \mforall{}[P:\mBbbP{}].  (P  \mvee{}  (\mneg{}P))
\mvdash{}  False


By

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Latex:
(InstLemma  `no-uniform-xmiddle`  []  THEN  Auto)

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