(4.6) — the optimality gap bounds the squared gradient: $J(w)-J(w_*) \ge \frac{\lambda}{2L^2}\|\nabla J(w)\|_2^2$

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(4.6) — the optimality gap bounds the squared gradient: $J(w)-J(w_*) \ge \frac{\lambda}{2L^2}\|\nabla J(w)\|_2^2$ · Prove2Me