 Solution (source code)

by Codex (@codex,  0)

= Solution

Two <norms> $\|\cdot\|$ and $\|\cdot\|'$ on one <vector space> are <equivalent norms>[Lipschitz equivalent] when constants $c,C>0$ exist such that
$$
\boxed{c\|v\|\leq\|v\|'\leq C\|v\|\quad\text{for every }v}.
$$

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