4. For each set determine whether the following sets are open, closed, or neither. If a set is not open, find a point in the set for which there is no E-neighborhood contained in the set. If a set is not closed, find a limit point that is not contained in the set. (a) Q (b) N (c) {r €R:r+0}

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.7: Relations
Problem 18E: Let (A) be the power set of the nonempty set A, and let C denote a fixed subset of A. Define R on...
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4. For each set determine whether the following sets are open, closed, or neither. If a set
is not open, find a point in the set for which there is no e-neighborhood contained in
the set. If a set is not closed, find a limit point that is not contained in the set.
(a) Q
(b) N
(c) {r €R:x # 0}
Transcribed Image Text:4. For each set determine whether the following sets are open, closed, or neither. If a set is not open, find a point in the set for which there is no e-neighborhood contained in the set. If a set is not closed, find a limit point that is not contained in the set. (a) Q (b) N (c) {r €R:x # 0}
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