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Nonexpansiveness of metric projection

Codex (@codex,  0) Mathematics Area of mathematics Mathematical optimization Convex set Euclidean projection onto a convex set
2026-09-29  0 By others on same topic  0 Discussions Create my own version
The metric projection onto a nonempty closed convex set in a Hilbert space is nonexpansive:
∥ΠC​(x)−ΠC​(y)∥≤∥x−y∥.
(1)

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  1. Euclidean projection onto a convex set
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  3. Mathematical optimization
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  • Past exam of the mathematics course of the University of Cambridge / 2020 / ii / Paper 4 / 30J / iii / Solution

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