Step
*
2
1
1
of Lemma
reg-seq-adjust_wf
.....assertion.....
1. n : ℕ+
2. x : ℕ+ ⟶ ℤ
3. regular-seq(x)
4. ∀i:ℕ+. (i < n
⇒ (|x i| ≤ 4))
5. ¬(n = 1 ∈ ℤ)
6. ∀[g:ℕ+ ⟶ ℤ]. 4-regular-seq(g) supposing ∀n:ℕ+. (|(x n) - g n| ≤ 6)
7. n1 : ℕ+@i
8. n1 < n
⊢ |(x n1) - 2| ≤ (|x n1| + |-2|)
BY
{ (RWO "int-triangle-inequality<" 0 THEN Auto) }
Latex:
Latex:
.....assertion.....
1. n : \mBbbN{}\msupplus{}
2. x : \mBbbN{}\msupplus{} {}\mrightarrow{} \mBbbZ{}
3. regular-seq(x)
4. \mforall{}i:\mBbbN{}\msupplus{}. (i < n {}\mRightarrow{} (|x i| \mleq{} 4))
5. \mneg{}(n = 1)
6. \mforall{}[g:\mBbbN{}\msupplus{} {}\mrightarrow{} \mBbbZ{}]. 4-regular-seq(g) supposing \mforall{}n:\mBbbN{}\msupplus{}. (|(x n) - g n| \mleq{} 6)
7. n1 : \mBbbN{}\msupplus{}@i
8. n1 < n
\mvdash{} |(x n1) - 2| \mleq{} (|x n1| + |-2|)
By
Latex:
(RWO "int-triangle-inequality<" 0 THEN Auto)
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