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Step * 1 1 of Lemma no-uniform-xmiddle


1. x : ∀[P:ℙ]. (P ∨ (¬P))@i'
⊢ False
BY
{ (Assert ⌜¬↑isl(x)⌝⋅ THEN Auto) }

1
.....assertion..... 
1. x : ∀[P:ℙ]. (P ∨ (¬P))@i'
⊢ ¬↑isl(x)

2
1. x : ∀[P:ℙ]. (P ∨ (¬P))@i'
2. ¬↑isl(x)
⊢ False

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Latex:

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Latex:

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


By

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Latex:
(Assert  \mkleeneopen{}\mneg{}\muparrow{}isl(x)\mkleeneclose{}\mcdot{}  THEN  Auto)

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