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 ane point, (d) a set which is not an interval but is a nbd. of each of its points.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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b,c,d only
8. Give an example of each oj 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 oj 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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