(15); (d) uses the definition in eq

+ 2ηG2 0 (c) ≤ O h RG0√ K + 1 + [RG1]2F K + 1 i (d) ≤ O[ϵ], where (a) uses the convexity of the function f(x), the definition of xK, (b) uses the inequality above, the fact that ∥x∗∥2 ≤ R, x0 = 0, (c) uses the definitions in eq · 2010