Step
*
1
of Lemma
reg-seq-adjust_wf
.....truecase.....
1. n : ℕ+
2. x : ℕ+ ⟶ ℤ
3. regular-seq(x)
4. ∀i:ℕ+. (i < n
⇒ (|x i| ≤ 4))
5. n = 1 ∈ ℤ
⊢ regular-seq(λi.if (i) < (n) then 2 else (x i))
BY
{ (Subst ⌜(λi.if (i) < (n) then 2 else (x i)) = x ∈ (ℕ+ ⟶ ℤ)⌝ 0⋅ THEN Auto)⋅ }
Latex:
Latex:
.....truecase.....
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. n = 1
\mvdash{} regular-seq(\mlambda{}i.if (i) < (n) then 2 else (x i))
By
Latex:
(Subst \mkleeneopen{}(\mlambda{}i.if (i) < (n) then 2 else (x i)) = x\mkleeneclose{} 0\mcdot{} THEN Auto)\mcdot{}
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