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Past exam of the mathematics course of the University of Cambridge / 2016 / ib / Paper 1 / 11G / b / iii

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2016 ib Paper 1 11G b
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iii
Write the subsequence as yn​=xkn​​ with strictly increasing indices kn​. If yℓ​=xm​, then d(yℓ​,yn​)=d(xm​,xkn​​). This is a subsequence of the real sequence converging to dm​, so
d(yℓ​,yn​)⟶dm​.​
(1)
The conclusion depends on the point xm​ itself, even if that point appears at several indices.

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