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) }
Latex:
Latex:
1.  \mforall{}[P:\mBbbP{}].  ((\mneg{}\mneg{}P)  {}\mRightarrow{}  P)@i'
2.  \mforall{}[P:\mBbbP{}].  (P  \mvee{}  (\mneg{}P))
\mvdash{}  False
By
Latex:
(InstLemma  `no-uniform-xmiddle`  []  THEN  Auto)
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