Proof of Theorem 2.1, p. 22 — pathwise bound on ‖x_k − x⋆ − γ∇f_i(x_k)‖² via Jensen and co-coercivity

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Proof of Theorem 2.1, p. 22 — pathwise bound on ‖x_k − x⋆ − γ∇f_i(x_k)‖² via Jensen and co-coercivity · Prove2Me