Step
*
1
1
of Lemma
lg-size-remove
.....wf.....
1. T : Type
2. g : LabeledGraph(T)
3. x : ℕ||g||
4. ∀[as:Top List]. ∀[n:{0...||as||}]. (||nth_tl(n;as)|| = (||as|| - n) ∈ ℤ)
⊢ ||firstn(x;g)|| ∈ ℤ
BY
{ ((InstLemma `length_firstn` [⌜Top⌝]⋅ THENA Auto) THEN All (Fold `lg-size`) THEN RWO "-1" 0 THEN Auto) }
Latex:
Latex:
.....wf.....
1. T : Type
2. g : LabeledGraph(T)
3. x : \mBbbN{}||g||
4. \mforall{}[as:Top List]. \mforall{}[n:\{0...||as||\}]. (||nth\_tl(n;as)|| = (||as|| - n))
\mvdash{} ||firstn(x;g)|| \mmember{} \mBbbZ{}
By
Latex:
((InstLemma `length\_firstn` [\mkleeneopen{}Top\mkleeneclose{}]\mcdot{} THENA Auto)
THEN All (Fold `lg-size`)
THEN RWO "-1" 0
THEN Auto)
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