Section e, p.4 — an effect accepting $\psi$ with certainty accepts $\varphi$ with probability $\ge |\langle\varphi|\psi\rangle|^2$

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Section e, p.4 — an effect accepting $\psi$ with certainty accepts $\varphi$ with probability $\ge |\langle\varphi|\psi\rangle|^2$ · Prove2Me