Step
*
1
of Lemma
existse-le-iff
1. es : EO@i'
2. e' : E@i
3. [P] : {e:E| loc(e) = loc(e') ∈ Id} ⟶ ℙ
4. ∃e≤e'.P[e]@i
⊢ P[e'] ∨ ∃e<e'.P[e]
BY
{ ((((D (-1)) THEN ExRepD THEN (D (-2))) THENL [OrRight; OrLeft])
THEN Auto
THEN Unfold `existse-before` 0
THEN (InstConcl [⌜e⌝])⋅
THEN Auto) }
Latex:
Latex:
1. es : EO@i'
2. e' : E@i
3. [P] : \{e:E| loc(e) = loc(e')\} {}\mrightarrow{} \mBbbP{}
4. \mexists{}e\mleq{}e'.P[e]@i
\mvdash{} P[e'] \mvee{} \mexists{}e<e'.P[e]
By
Latex:
((((D (-1)) THEN ExRepD THEN (D (-2))) THENL [OrRight; OrLeft])
THEN Auto
THEN Unfold `existse-before` 0
THEN (InstConcl [\mkleeneopen{}e\mkleeneclose{}])\mcdot{}
THEN Auto)
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