§4.5, proof of Theorem 4.4, p. 307 — third term: (∇f(y_{t+1}) − ∇f(x_t))⊤(y_{t+1} − x_{t+1}) ≤ (β/2)‖y_{t+1} − x_t‖² + (β/2)‖y_{t+1} − x_{t+1}‖²

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§4.5, proof of Theorem 4.4, p. 307 — third term: (∇f(y_{t+1}) − ∇f(x_t))⊤(y_{t+1} − x_{t+1}) ≤ (β/2)‖y_{t+1} − x_t‖² + (β/2)‖y_{t+1} − x_{t+1}‖² · Prove2Me