Hardy's $N^2$ fiducial projectors $|n\rangle\langle n|$, $|mn\rangle_x\langle mn|$, $|mn\rangle_y\langle mn|$

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Hardy's $N^2$ fiducial projectors $|n\rangle\langle n|$, $|mn\rangle_x\langle mn|$, $|mn\rangle_y\langle mn|$ · Prove2Me