Let y be a boundary point of a nonempty, convex set S in a Euclidean space X.

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Let y be a boundary point of a nonempty, convex set S in a Euclidean space X. There exists a supporting hyperplane at y; that is, there exists a continuous linear functional f ∈ X* such that
f (y) ≤ f (x) for every x ∈ S
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