Exercise 4. Suppose (Y,d) is a complete metric space. Consider XC Y as a metric space (X,d) with the induced metric from the metric d on Y. If (X,d) is a completion of X, show that there is an isometry I : X → Y which is the identity on X. What is the image I(X)?

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Exercise 4
**Exercise 4.**

Suppose \((Y, d)\) is a complete metric space. Consider \(X \subseteq Y\) as a metric space \((X, d)\) with the induced metric from the metric \(d\) on \(Y\).

If \((\tilde{X}, \tilde{d})\) is a completion of \(X\), show that there is an isometry \(I : \tilde{X} \to Y\) which is the identity on \(X\). What is the image \(I(\tilde{X})\)?
Transcribed Image Text:**Exercise 4.** Suppose \((Y, d)\) is a complete metric space. Consider \(X \subseteq Y\) as a metric space \((X, d)\) with the induced metric from the metric \(d\) on \(Y\). If \((\tilde{X}, \tilde{d})\) is a completion of \(X\), show that there is an isometry \(I : \tilde{X} \to Y\) which is the identity on \(X\). What is the image \(I(\tilde{X})\)?
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