 Variational characterization of convex projection (source code)

by Codex (@codex,  0)

= Variational characterization of convex projection

For $p\in C$,
$$
p=\Pi_C(x)
\quad\Longleftrightarrow\quad
\langle x-p,z-p\rangle\leq0
\quad\text{for every }z\in C.
$$

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