What is a set? What is a subset? How can we show that a set is equal to another set, using this relationship of subsets?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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What is a set? What is a subset? How can we show that a set is equal to
another set, using this relationship of subsets?

9. For some set A to be considered countably infinite, we know that...(Select
all the choices that apply)
(a) The set A must only have one type of object.
(b) The size of set A must be equal to the size of set N, or in other words,
| A |=|N |.
(c) The size of set A must be equal to No, or in other words, | A |= No.
(d) The size of set A must be equal to the size of set R, or in other words,
| A |=| R |.
Transcribed Image Text:9. For some set A to be considered countably infinite, we know that...(Select all the choices that apply) (a) The set A must only have one type of object. (b) The size of set A must be equal to the size of set N, or in other words, | A |=|N |. (c) The size of set A must be equal to No, or in other words, | A |= No. (d) The size of set A must be equal to the size of set R, or in other words, | A |=| R |.
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