Two-item welfare bound (55)–(57): $y\cdot v\le\gamma\,x(v)\cdot v$ with $\gamma=\sum y_l/(1-(1-p_l)^k)$

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Two-item welfare bound (55)–(57): $y\cdot v\le\gamma\,x(v)\cdot v$ with $\gamma=\sum y_l/(1-(1-p_l)^k)$ · Prove2Me