Problem 2.38. Show by example(s) that Proposition 2.37 does not generally hold if Y is not closed (respectively, not open) in X.
Problem 2.38. Show by example(s) that Proposition 2.37 does not generally hold if Y is not closed (respectively, not open) in X.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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solve 2.38
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Step 1
Let the space be with usual topology and let Y=[1,2) is a subspace of but it is neither open nor closed under usual topology.
Let Y=[1,2) has the subspace topology i.e any open set in Y is of the form where U is open in the space X with usual topology.
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