Theorem 4.1, formula (4.6) — the $x$-projection of a subgradient of $L_U$ with null $y$-projection is a subgradient of $\Phi$

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Theorem 4.1, formula (4.6) — the $x$-projection of a subgradient of $L_U$ with null $y$-projection is a subgradient of $\Phi$ · Prove2Me