Exercise 1) Assume that X is a Hausdorff space. If D C X is a dense subset of X. If the point xD is an isolated point in D for the induced topology on the subset DC X, show that x is also an isolated point in X. 2) Does the result above remain true if X is not Hausdorff?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.7: Distinguishable Permutations And Combinations
Problem 29E
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Exercise 3 Part 2
Exercise
1) Assume that X is a Hausdorff space. If D C X is a dense subset of X. If
the point xD is an isolated point in D for the induced topology on the subset DCX, show that
x is also an isolated point in X.
2) Does the result above remain true if X is not Hausdorff?
4.
nse
Transcribed Image Text:Exercise 1) Assume that X is a Hausdorff space. If D C X is a dense subset of X. If the point xD is an isolated point in D for the induced topology on the subset DCX, show that x is also an isolated point in X. 2) Does the result above remain true if X is not Hausdorff? 4. nse
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