Step
*
of Lemma
ratio-test
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∀x:ℕ ⟶ ℝ. ∀N:ℕ.
((∀c:{c:ℝ| (r0 ≤ c) ∧ (c < r1)} . ((∀n:{N...}. (|x[n + 1]| ≤ (c * |x[n]|)))
⇒ Σn.x[n]↓))
∧ (∀c:{c:ℝ| r1 < c} . ((∀n:{N...}. ((c * |x[n]|) < |x[n + 1]|))
⇒ Σn.x[n]↑)))
BY
{ Auto }
1
1. x : ℕ ⟶ ℝ
2. N : ℕ
3. c : {c:ℝ| (r0 ≤ c) ∧ (c < r1)}
4. ∀n:{N...}. (|x[n + 1]| ≤ (c * |x[n]|))
⊢ Σn.x[n]↓
2
1. x : ℕ ⟶ ℝ
2. N : ℕ
3. ∀c:{c:ℝ| (r0 ≤ c) ∧ (c < r1)} . ((∀n:{N...}. (|x[n + 1]| ≤ (c * |x[n]|)))
⇒ Σn.x[n]↓)
4. c : {c:ℝ| r1 < c}
5. ∀n:{N...}. ((c * |x[n]|) < |x[n + 1]|)
⊢ Σn.x[n]↑
Latex:
Latex:
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\mforall{}x:\mBbbN{} {}\mrightarrow{} \mBbbR{}. \mforall{}N:\mBbbN{}.
((\mforall{}c:\{c:\mBbbR{}| (r0 \mleq{} c) \mwedge{} (c < r1)\} . ((\mforall{}n:\{N...\}. (|x[n + 1]| \mleq{} (c * |x[n]|))) {}\mRightarrow{} \mSigma{}n.x[n]\mdownarrow{}))
\mwedge{} (\mforall{}c:\{c:\mBbbR{}| r1 < c\} . ((\mforall{}n:\{N...\}. ((c * |x[n]|) < |x[n + 1]|)) {}\mRightarrow{} \mSigma{}n.x[n]\muparrow{})))
By
Latex:
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