This document contains exercises and solutions related to monotone sequences, convergent subsequences, and the Bolzano-Weierstrass theorem from an introduction to real analysis course. It includes 4 problems examining properties of specific sequences, showing whether they are bounded/monotone and finding their limits, as well as examples of an unbounded sequence with a convergent subsequence and sequences that diverge. The solutions provide detailed proofs of the properties of each sequence using induction and algebraic manipulations.
Jawaban latihan soal bagian 2.1 pada buku Analisis Real karangan Drs. Sutrima, M.SI
cetakan : pertama, Juni 2010
penerbit : Javatechno Publisher (Jln. Ahmad Yani 365A, Kartasura, Sukoharjo, Jawa Tengah, Indonesia - 57162
Jawaban latihan soal bagian 2.2 pada buku Analisis Real karangan Drs. Sutrima, M.SI
cetakan : pertama, Juni 2010
penerbit : Javatechno Publisher (Jln. Ahmad Yani 365A, Kartasura, Sukoharjo, Jawa Tengah, Indonesia - 57162
Jawaban latihan soal bagian 2.1 pada buku Analisis Real karangan Drs. Sutrima, M.SI
cetakan : pertama, Juni 2010
penerbit : Javatechno Publisher (Jln. Ahmad Yani 365A, Kartasura, Sukoharjo, Jawa Tengah, Indonesia - 57162
Jawaban latihan soal bagian 2.2 pada buku Analisis Real karangan Drs. Sutrima, M.SI
cetakan : pertama, Juni 2010
penerbit : Javatechno Publisher (Jln. Ahmad Yani 365A, Kartasura, Sukoharjo, Jawa Tengah, Indonesia - 57162
Analisis Real (Barisan dan Bilangan Real) Latihan bagian 2.5Arvina Frida Karela
Jawaban latihan soal bagian 2.5 pada buku Analisis Real karangan Drs. Sutrima, M.SI
cetakan : pertama, Juni 2010
penerbit : Javatechno Publisher (Jln. Ahmad Yani 365A, Kartasura, Sukoharjo, Jawa Tengah, Indonesia - 57162
Jawaban latihan soal bagian 2.3 pada buku Analisis Real karangan Drs. Sutrima, M.SI
cetakan : pertama, Juni 2010
penerbit : Javatechno Publisher (Jln. Ahmad Yani 365A, Kartasura, Sukoharjo, Jawa Tengah, Indonesia - 57162
Analisis Real (Barisan dan Bilangan Real) Latihan bagian 2.5Arvina Frida Karela
Jawaban latihan soal bagian 2.5 pada buku Analisis Real karangan Drs. Sutrima, M.SI
cetakan : pertama, Juni 2010
penerbit : Javatechno Publisher (Jln. Ahmad Yani 365A, Kartasura, Sukoharjo, Jawa Tengah, Indonesia - 57162
Jawaban latihan soal bagian 2.3 pada buku Analisis Real karangan Drs. Sutrima, M.SI
cetakan : pertama, Juni 2010
penerbit : Javatechno Publisher (Jln. Ahmad Yani 365A, Kartasura, Sukoharjo, Jawa Tengah, Indonesia - 57162
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1. INTRODUCTION TO REAL ANALYSIS 1
INDIVIDUAL TASK
EXERCISES 3.3 MONOTONE SEQUENCES
EXERCISES 3.4 SUBSEQUENCES AND THE BOLZANO-WEIERSTRASS
THEOREM
By:
Muhammad Nur Chalim
4101414101
MATHEMATICS DEPARTMENT
MATHEMATICS AND NATURAL SCIENCES FACULTY
SEMARANG STATE UNIVERSITY
2016
2. EXERCISES 3.3
Problem
1. Let 𝑥1 ≔ 8 and 𝑥 𝑛+1 ≔
1
2
𝑥 𝑛 + 2 for 𝑛 ∈ 𝑁. Show that (𝑥 𝑛) is bounded and monotone.
Find the limit.
2. Let 𝑥1 > 1 and 𝑥 𝑛+1 ≔ 2 −
1
𝑥 𝑛
for 𝑛 ∈ 𝑁. Show that (𝑥 𝑛) is bounded and monotone.
Find the limit.
3. Let 𝑥1 ≥ 2 and 𝑥 𝑛+1 ≔ 1 + √ 𝑥 𝑛 − 1 for 𝑛 ∈ 𝑁. show that (𝑥 𝑛) is decreasing and
bounded below by 2. Find the limit
4. Let 𝑥1 ≔ 1 and 𝑥 𝑛+1 ≔ √2 + 𝑥 𝑛 for 𝑛 ∈ 𝑁. Show that (𝑥 𝑛) converges and find the
limit.
Solution 3.3
1. Let 𝑥1 ≔ 8 and 𝑥 𝑛+1 ≔
1
2
𝑥 𝑛 + 2 for 𝑛 ∈ ℕ. Show that ( 𝑥 𝑛) is bounded and monotone.
Find the limit.
Proof:
First, let’s show that it is monotone decreasing.
Note that 𝑥1 = 8 > 𝑥2 = 6. For induction, assume that 𝑥 𝑘 > 𝑥 𝑘+1.
Next notice
𝑥 𝑘 > 𝑥 𝑘+1
⇔
1
2
𝑥 𝑘 >
1
2
𝑥 𝑘+1
⇔
1
2
𝑥 𝑘 + 2 >
1
2
𝑥 𝑘+1 + 2
⇔ 𝑥 𝑘+1 > 𝑥 𝑘+2
Since the sequence is decreasing and 𝑥 𝑛 > 0 for all 𝑛, we can be assured that the upper
bound is 8 and we have a lower bound of 0.
To find the limit, we use the same technique as the examples.
1
2
𝑥 𝑘 + 2 =
1
2
𝑥 𝑘+1 + 2
3. ⇔ 𝑥 =
1
2
𝑥 + 2
⇔ 𝑥 −
1
2
𝑥 = 2
⇔
1
2
𝑥 = 2
⇔ 𝑥 =
2
1
2
= 4 both limits must be 𝑥.
2. Let 𝑥1 > 1 and 𝑥 𝑛+1 ≔ 2 −
1
𝑥 𝑛
for 𝑛 ∈ ℕ. Show that ( 𝑥 𝑛) is bounded and monotone.
Find the limit.
Proof:
Since 𝑥1 > 1, we have that
1
𝑥1
< 1. It means that 𝑥2 = 2 −
1
𝑥1
> 1.
We would like to show that 𝑥 𝑛 > 1 for all 𝑛. By induction, we see that if 𝑥 𝑘 > 1, then
𝑥 𝑘+1 = 2 −
1
𝑥1
> 1.
From this, we obtain that at this point we are bounded above by 2 and below by 1.
Now, let’s show that it is monotone (decreasing). To do this, we want to start by looking
at
0 < (𝑥1 − 1)2
⇔ 0 < 𝑥1
2
− 2𝑥1 + 1
⇔ 2𝑥1 < 𝑥1
2
+ 1 (multiplied by 1/𝑥1)
⇔ 2 < 𝑥1 +
1
𝑥1
⇔ 2 −
1
𝑥1
< 𝑥1
⇔ 𝑥2 < 𝑥1
That only takes care of the first case. Now we use induction to finish the monotone.
𝑥 𝑘+1 < 𝑥 𝑘
⇔
1
𝑥 𝑘+1
>
1
𝑥 𝑘
⇔ −
1
𝑥 𝑘+1
< −
1
𝑥 𝑘
⇔ 2 −
1
𝑥 𝑘+1
< 2 −
1
𝑥 𝑘
4. ⇔ 𝑥 𝑘+2 < 𝑥 𝑘+1
To find the limit, we use the same technique as the examples in the book
𝑥 𝑛+1 = 2 −
1
𝑥 𝑛
⇔ 𝑥 = 2 −
1
𝑥
⇔ 𝑥 +
1
𝑥
= 2 (multiplied by 𝑥)
⇔ 𝑥2
+ 1 = 2
⇔ 𝑥2
+ 1 − 2 = 0
⇔ (𝑥 + 2)(𝑥 − 1) = 0
𝑥 = 1 or 𝑥 = −2
3. Let 𝑥1 ≥ 2 and 𝑥 𝑛+1 ≔ 1 + √ 𝑥 𝑛 − 1 for 𝑛 ∈ ℕ. Show that ( 𝑥 𝑛) is decreasing and
bounded below by 2. Find the limit.
Proof:
Since 𝑥1 ≥ 2, we have that 𝑥1 − 1 ≥ 1
𝑥1 − 1 ≥ 1
⇔ √𝑥1 − 1 ≥ √1
⇔ √𝑥1 − 1 ≥ 1
⇔ 1 + √𝑥1 − 1 ≥ 1 + 1
⇔ 1 + √ 𝑥1 − 1 ≥ 2 (since given that 𝑥 𝑛+1 ≔ 1 + √ 𝑥 𝑛 − 1)
⇔ 𝑥2 ≥ 2
Using induction and a similar argument, we find 𝑥 𝑛+1 ≥ 2. That takes care of bounded.
We now need to work on monotone. To do this we start by noticing that if 𝑥1 − 1 > 1,
then 𝑥1 − 1 > √ 𝑥1 − 1 = 𝑥1 > √ 𝑥1 − 1 + 1 = 𝑥2.
That is our base case, we then assume that 𝑥 𝑘 > 𝑥 𝑘+1
𝑥 𝑘+1 < 𝑥 𝑘
⇔ 𝑥 𝑘+1 − 1 < 𝑥 𝑘 − 1
⇔ √𝑥 𝑘+1 − 1 < √𝑥 𝑘 − 1
⇔ 1 + √𝑥 𝑘+1 − 1 < 1 + √𝑥 𝑘 − 1
5. ⇔ 𝑥 𝑘+2 < 𝑥 𝑘+1
Again, we use the same technique as the examples in the book
𝑥 𝑛+1 = 2 −
1
𝑥 𝑛
⇔ 𝑥 = 2 −
1
𝑥
⇔ 𝑥 = 1
4. Let 𝑥1 ≔ 1 and 𝑥 𝑛+1 ≔ √2 + 𝑥 𝑛 for 𝑛 ∈ ℕ. Show that ( 𝑥 𝑛) converges and find the
limit.
Proof:
Like the first problem, let’s show taht it is monotone increasing first. Note that 𝑥1 = 1 <
𝑥2 = √3. For induction, assume that 𝑥 𝑘 < 𝑥 𝑘+1.
𝑥 𝑘 < 𝑥 𝑘+1
⇔ 2 + 𝑥 𝑘 < 2 + 𝑥 𝑘+1
⇔ √2 + 𝑥 𝑘 < √2 + 𝑥 𝑘+1
⇔ 𝑥 𝑘+1 < 𝑥 𝑘+2
Since the sequence is increasing and 𝑥 𝑛 > 0 for all 𝑛, we now want to obtain an upper
bound on the sequence. To do this, note that 𝑥1 = 1 < 𝑥2 = √3 < 4. Using induction
that 𝑥 𝑘 < 4, we get
𝑥 𝑘+1 = √2 + 𝑥 𝑘
⇔ 𝑥 𝑘+1 < √2 + 4
⇔ 𝑥 𝑘+1 = √6
⇔ 𝑥 𝑘+1 < 2
This again, allows us to use MCT to say that the swquence converges. Lasty, to find the
limit, we do what we have done for the first three problems.
𝑥 𝑛+1 = √2 + 𝑥 𝑛
⇔ 𝑥 = √2 + 𝑥
⇔ 𝑥 = 2
6. EXERCISES 3.4
Problem
1. Give an example of an unbounded sequence that has a convergent subsequence.
2. Use the method of Example 3.4.3(b) to show that if 0 < 𝑐 < 1, then lim (𝑐
1
𝑛 ) = 1
3. Let (𝑓𝑛) be the Fibonacci sequence of Example 3.1.2(d), and let 𝑥 𝑛 ≔
𝑓𝑛+1
𝑓𝑛
. Given that
lim( 𝑥 𝑛) = 𝐿 exists, determine the value of 𝐿.
4. Show that the following sequences are divergent.
(a) (1 − (−1) 𝑛
+
1
𝑛
),
(b) (sin
𝑛𝜋
4
)
Solution 3.4
1. Let 𝑥2𝑛−1 ∶= 2𝑛 − 1,
So we will obtain 𝑥2𝑛 ∶=
1
2𝑛
;
Its mean that (𝑥 𝑛) = (1 ,
1
2
,3,
1
4
,5,
1
6
, . . . ).
We can find an example of an unbounded sequence that has a convergent subsequence is
(𝑥 𝑛) = (1 ,
1
2
, 3,
1
4
,5,
1
6
, . . . ).
2. We assume that 𝑥 𝑛 ∶= 𝑐
1
𝑛 ,
where 0 < 𝑐 < 1,
then (𝑥 𝑛)is increasing and bounded,
so it has a limit x.
Since 𝑥2𝑛 = √ 𝑥 𝑛,
the limit satisfies 𝑥 = √ 𝑥, 𝑠𝑜 𝑥 = 0 𝑜𝑟 𝑥 = 1.
7. Since 𝑥 = 0 is impossible ,
we have 𝑥 = 1.
2. Since 𝑥 𝑛 ≥ 1 for all 𝑛 ∈ 𝑁, 𝐿 > 0.
Further, we have 𝑥 𝑛 =
1
𝑥 𝑛−1
+ 1 → 𝐿 =
1
𝐿
+ 1 → 𝐿2
− 𝐿 − 1 = 0 → 𝐿 =
1
2
(1 + √5)
4. (a) 𝑥2𝑛 → 0 𝑎𝑛𝑑 𝑥2𝑛+1 → 2.
(b) 𝑥8𝑛 = 0 and 𝑥8𝑛+1 = 𝑠𝑖𝑛(
𝜋
4
) =
1
√2
for all 𝑛 ∈ 𝑁