Let $V$ be a normed space and denote by $$ B_1 := \{ v \in V: ||v|| \leq 1\}, \quad B_c := \{ v \in V : ||v|| \leq c \}, \quad cB= \{ c v : v \in B_1 \}, \quad c \geq 0. $$ Now clearly $cB \subset B_c$ for all $c \geq 0$. What are some examples where the converse inclusion does not hold?
2026-04-09 02:19:37.1775701177
Closed ball in a normed space
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There are none. If $v\in B_c$, then $v=c\frac vc\in cB_1$.