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8. Give an example of each of the following : (a) a set which is a nbd. of each of its points, (b) a set which is not a nbd. of any of its points, (c) a set which is a nbd. of each of its points with the exception of опе point, (d) a set which is not an interval but is a nbd. of each of its points.

8. Give an example of each of the following : (a) a set which is a nbd. of each of its points, (b) a set which is not a nbd. of any of its points, (c) a set which is a nbd. of each of its points with the exception of опе point, (d) a set which is not an interval but is a nbd. of each of its points.

Advanced Engineering Mathematics
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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8. Give an example of each ofj the following : (a) a set which is a nbd. of each of its points, (b) a set which is not a nbd. of any of its points, (c) a set which is a nbd. of each of its points with the exception of опе point, (d) a set which is not an interval but is a nbd. of each of its points.
Transcribed Image Text:8. Give an example of each ofj the following : (a) a set which is a nbd. of each of its points, (b) a set which is not a nbd. of any of its points, (c) a set which is a nbd. of each of its points with the exception of опе point, (d) a set which is not an interval but is a nbd. of each of its points.
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