Step
*
1
1
of Lemma
hd-es-interval
1. es : EO
2. e : E
3. e' : E
4. e ≤loc e'
5. i : ℕ
6. i < ||[e, e']|| c∧ (e = [e, e'][i] ∈ E)
7. i = 0 ∈ ℤ
⊢ hd([e, e']) = e ∈ E
BY
{ (ExRepD THEN (HypSubst' (-1) (-2)) THEN Assert ⌈hd([e, e']) = [e, e'][0] ∈ E⌉⋅ THEN Auto) }
Latex:
1. es : EO
2. e : E
3. e' : E
4. e \mleq{}loc e'
5. i : \mBbbN{}
6. i < ||[e, e']|| c\mwedge{} (e = [e, e'][i])
7. i = 0
\mvdash{} hd([e, e']) = e
By
(ExRepD THEN (HypSubst' (-1) (-2)) THEN Assert \mkleeneopen{}hd([e, e']) = [e, e'][0]\mkleeneclose{}\mcdot{} THEN Auto)
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