Proof of Theorem 1, p. 3 — if $e^{i\varepsilon D}$ is logical for all $\varepsilon$, then $(I-P)DP=0$

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Proof of Theorem 1, p. 3 — if $e^{i\varepsilon D}$ is logical for all $\varepsilon$, then $(I-P)DP=0$ · Prove2Me