Lemma 19 — $f(x)-f(x^*)\ge-\|\gamma^*\|\,\|g(x)_+\|$ at a Lagrangian saddle point · Prove2Me

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Lemma 19 — $f(x)-f(x^*)\ge-\|\gamma^*\|\,\|g(x)_+\|$ at a Lagrangian saddle point · Prove2Me