Let $X$ be an inner product space over $K$ and let $x_0$∈ X. Find $x ∈ ∂B(0, 1)$ that is closest to $x_0$.
How to start this, I don't have any idea.
2026-04-01 15:54:01.1775058841
Closest distance between a point from the boundary of the unit ball and a point from the inner product space
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