Let $1 \leq \alpha\leq2$. Find an example of a normed space $G$ and a set $A \subset G$ such that $d(A)=\alpha r(A)$. $($Where $r(A),d(A)$ are the Chebyshev radius and diameter$)$.
2026-03-30 13:15:36.1774876536
exercise of information-based approximation
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