00 (8n-5 4. Prove is a Cauchy sequence in R with the usual metric dâ(x, y) = |x – y|

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10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Question 4
1. Use the definition of a convergent sequence to show {7 - converges to 7 where
n=1
8.
{7- is considered to be a sequence in R with the usual metric dg(x, y) = |x – y|
nn=1
2. Let {Sn}=1 be an unbounded sequence of negative numbers. Show {sn}=1 has a
subsequence {Sng}, such that {Sng } tends to minus infinity
k=1
<%3D1
3. Let {an}n=1 , {bn}=1, {Cn}n=1 , and {dn}=1 be Cauchy sequences in R with the usual
metric. Show {Tn}n=1 where x = (an, bn , Cn, dn) is Cauchy in R*
00
(8n-5"
4. Prove { , is a Cauchy sequence in R with the usual metric dg (x, y) = |x – y|
In=1
5. Suppose {pn}n=1 is a Cauchy sequence in a metric space, , and some subsequence {pn},-1
converges to a point, p E X . Prove the full sequence, {p„}n=1_Converges to p OEN
00
3n
6. (a) Prove
is a decreasing sequence in R 6.
3n-1) n=1
00
3n
(b) Is
a convergent sequence in IR with the usual metric dg(x,y) = |x – yl
3n-1) n=1
(c) Is {-(n²)}"=1 a convergent sequence in R with the usual metric t?
Transcribed Image Text:1. Use the definition of a convergent sequence to show {7 - converges to 7 where n=1 8. {7- is considered to be a sequence in R with the usual metric dg(x, y) = |x – y| nn=1 2. Let {Sn}=1 be an unbounded sequence of negative numbers. Show {sn}=1 has a subsequence {Sng}, such that {Sng } tends to minus infinity k=1 <%3D1 3. Let {an}n=1 , {bn}=1, {Cn}n=1 , and {dn}=1 be Cauchy sequences in R with the usual metric. Show {Tn}n=1 where x = (an, bn , Cn, dn) is Cauchy in R* 00 (8n-5" 4. Prove { , is a Cauchy sequence in R with the usual metric dg (x, y) = |x – y| In=1 5. Suppose {pn}n=1 is a Cauchy sequence in a metric space, , and some subsequence {pn},-1 converges to a point, p E X . Prove the full sequence, {p„}n=1_Converges to p OEN 00 3n 6. (a) Prove is a decreasing sequence in R 6. 3n-1) n=1 00 3n (b) Is a convergent sequence in IR with the usual metric dg(x,y) = |x – yl 3n-1) n=1 (c) Is {-(n²)}"=1 a convergent sequence in R with the usual metric t?
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