. Problem 4: critize the following proof – find all mistakes(there may be more than one). A mistake includes but is not limited to a false statement; a statement that is not a logic consequence of its proceeding statement; a statement that is not usefull for or related to the final results. Prove lim,40 sin(1/1) does not exist. Proof Let e = 0.1 > 0. For any 6 > 0, by THM1.17 part 4, pick N, such that < 26x, then 1 + 2N7 2N7 So when ro = the limit does not exist. we have |ro| < d and sin() = sin( + 2N7) = 0.5 > €o. This shows %3D %3D

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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. Problem 4: critize the following proof – find all mistakes(there may be more than one).
A mistake includes but is not limited to a false statement; a statement that is not a logic
consequence of its proceeding statement; a statement that is not usefull for or related to the
final results.
Prove lim, 40 sin(1/1) does not exist.
Proof
Let e = 0.1 > 0. For any 6 > 0, by THM1.17 part 4, pick N, such that < 267, then
1
+ 2N7
2N T
So when ro =
the limit does not exist.
we have |ro| < s and sin() = sin( + 2N7) = 0.5 > €0. This shows
%3D
Transcribed Image Text:. Problem 4: critize the following proof – find all mistakes(there may be more than one). A mistake includes but is not limited to a false statement; a statement that is not a logic consequence of its proceeding statement; a statement that is not usefull for or related to the final results. Prove lim, 40 sin(1/1) does not exist. Proof Let e = 0.1 > 0. For any 6 > 0, by THM1.17 part 4, pick N, such that < 267, then 1 + 2N7 2N T So when ro = the limit does not exist. we have |ro| < s and sin() = sin( + 2N7) = 0.5 > €0. This shows %3D
THEOREM 1.17 The following statements are equivalent.
1. If a and b are positive real numbers, then there exists a positive integer n
such that na > b.
2. The set of positive integers is not bounded above.
3. For each real number x, there exists an integer n such that n <x < n+1.
4. For each positive real number x, there exists a positive integer n such that
1/n < x.
Transcribed Image Text:THEOREM 1.17 The following statements are equivalent. 1. If a and b are positive real numbers, then there exists a positive integer n such that na > b. 2. The set of positive integers is not bounded above. 3. For each real number x, there exists an integer n such that n <x < n+1. 4. For each positive real number x, there exists a positive integer n such that 1/n < x.
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