Lemma 9 — $\|Ad_x\|_2\le(-d_x^THd_x-2\Delta(d_x))^{1/2}$ at a trust-region minimizer · Prove2Me

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Lemma 9 — $\|Ad_x\|_2\le(-d_x^THd_x-2\Delta(d_x))^{1/2}$ at a trust-region minimizer · Prove2Me