3. (a) For each n e N, let An = {nk : k E N} %3D i. Determine A1N A2 ii. Determine U An n=1 iii. Determine N An n=1 (Hint: Try to figure out what the sets A1, A2, A3, ... etc are describing)
3. (a) For each n e N, let An = {nk : k E N} %3D i. Determine A1N A2 ii. Determine U An n=1 iii. Determine N An n=1 (Hint: Try to figure out what the sets A1, A2, A3, ... etc are describing)
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Question
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For each n ∈ N, let An = {nk : k ∈ N}
![3. (a) For each n e N, let An = {nk : k E N}
i. Determine A1N A2
ii. Determine U An
n=1
iii. Determine N An
n=1
(Hint: Try to figure out what the sets A1, A2, A3,.. etc are describing)
(b) Let A CR? be given by A = {(pv2, q7) : p, q E Q}. Prove that A is countable.
(c) Determine with proof, the supremum, infimum, minimum and maximum of the following subset
of R:
A = Q°n (0, 7]
(Do not only state; sup A =, inf A =, max A
-, min A
You need to also
provide detailed justification for your answers.)
1
(d) Let r E R. If r > 0, then prove that there exists a n eN such that 0<
<T.
n2](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F23cdc0d7-7d33-42d3-8fb9-b8ab1ea99c34%2F2006206c-1e3c-42e1-9e62-b82862df9a63%2Fc6kshx_processed.jpeg&w=3840&q=75)
Transcribed Image Text:3. (a) For each n e N, let An = {nk : k E N}
i. Determine A1N A2
ii. Determine U An
n=1
iii. Determine N An
n=1
(Hint: Try to figure out what the sets A1, A2, A3,.. etc are describing)
(b) Let A CR? be given by A = {(pv2, q7) : p, q E Q}. Prove that A is countable.
(c) Determine with proof, the supremum, infimum, minimum and maximum of the following subset
of R:
A = Q°n (0, 7]
(Do not only state; sup A =, inf A =, max A
-, min A
You need to also
provide detailed justification for your answers.)
1
(d) Let r E R. If r > 0, then prove that there exists a n eN such that 0<
<T.
n2
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