Let SC R. Give counterexamples to show that the following statements are not true. (f) If S is open, then it contains at least two points. (g) If T is the set of isolated points of S, then T is closed. (h) If S is closed, then it has at least one limit point. (i) If S is infinite, then it has at least one limit point. (j) If S is compact, then it is an infinite set.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Let S be a subset of R. Give counterexamples to show that the following statements are not true.

Let SCR. Give counterexamples to show that the following statements are not true.
(f) If S is open, then it contains at least two points.
(g) If T is the set of isolated points of S, then T is closed.
(h) If S is closed, then it has at least one limit point.
(i) If S is infinite, then it has at least one limit point.
(j) If S is compact, then it is an infinite set.
Transcribed Image Text:Let SCR. Give counterexamples to show that the following statements are not true. (f) If S is open, then it contains at least two points. (g) If T is the set of isolated points of S, then T is closed. (h) If S is closed, then it has at least one limit point. (i) If S is infinite, then it has at least one limit point. (j) If S is compact, then it is an infinite set.
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