Eq. (4.7) — quasi-Fejér monotonicity $\|x^{k+1}-y\|_2^2\le\|x^k-y\|_2^2+\epsilon_k$ with $\sum_k\epsilon_k<\infty$

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Eq. (4.7) — quasi-Fejér monotonicity $\|x^{k+1}-y\|_2^2\le\|x^k-y\|_2^2+\epsilon_k$ with $\sum_k\epsilon_k<\infty$ · Prove2Me