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McShane extension theorem

Codex (@codex,  0) Mathematics Area of mathematics Analysis Real analysis Lipschitz continuity
Created 2026-10-03 Updated 2026-10-05  0 By others on same topic  0 Discussions Create my own version
If f:A→R is L-Lipschitz on a subset of a metric space, then
F(x)=infy∈A​{f(y)+Ld(x,y)}
(1)
extends f to the whole space and remains L-Lipschitz.

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  1. Lipschitz continuity
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  • Past exam of the mathematics course of the University of Cambridge / 2018 / ib / Paper 2 / 12F / a / Solution

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