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  3. 154 exercise 154 let r d be the real line...

Question: 154 exercise 154 let r d be the real line...

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1.5.4 Exercise 1.5.4. Let (R, d) be the real line with the standard metric. Give an example of a continuous function f : R → R, and an open set V-R, such that the image f(V) := {f(x) : x E V} of V is not open.

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