2 Find all limit points of a set B = {1, }, 4, 4,...} on the real line with the usual metric. Is B open or closed? Explain. 3 Give the closure B of a set B = (1,3] on the real line with the usual metric. 4 Give the set of limit points Ao of a singleton A = {(5, 2)} on the plane R2 with the discrete metric. 5 Can two disjoint sets be close? Justify your answer using an example.

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Author:Erwin Kreyszig
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2 Find all limit points of a set B =
= {1, 5,3, ,...} on the real line with the usual metric. Is
B open or closed? Explain.
3 Give the closure B of a set B = (1, 3] on the real line with the usual metric.
4 Give the set of limit points Ao of a singleton A = {(5, 2)} on the plane R? with the discrete
metric.
5 Can two disjoint sets be close? Justify your answer using an example.
Transcribed Image Text:2 Find all limit points of a set B = = {1, 5,3, ,...} on the real line with the usual metric. Is B open or closed? Explain. 3 Give the closure B of a set B = (1, 3] on the real line with the usual metric. 4 Give the set of limit points Ao of a singleton A = {(5, 2)} on the plane R? with the discrete metric. 5 Can two disjoint sets be close? Justify your answer using an example.
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