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

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