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Past exam of the mathematics course of the University of Cambridge / 2021 / iii / Paper 220 / 1 / c / Solution

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2021 iii Paper 220 1 c
2026-09-28  0 By others on same topic  0 Discussions Create my own version
The assertion is false. Join, at one common endpoint o, a line segment of length 1/n for every positive integer n, and use the intrinsic path metric. This is a real tree. It is totally bounded, because outside the first finitely many arms every point lies arbitrarily close to o, and it is complete; hence it is compact. Removing o leaves one connected component for every arm, so o has countably infinite multiplicity of a point in a real tree.

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