Space dilation $R_\alpha(\xi)$, widths $d_\eta(W)$, $d(W)$, $D(W)$ and the ratio $p(W)$ of a convex body

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Space dilation $R_\alpha(\xi)$, widths $d_\eta(W)$, $d(W)$, $D(W)$ and the ratio $p(W)$ of a convex body · Prove2Me