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Let \(\chi,\phi, \psi\) be a set of representative vectors of three unit rays in Hilbert space and let \(\chi',\phi', \psi'\) be another set of representatives of the same rays. Prove that \[(\chi,\phi)(\phi, \psi)(\psi, \chi) = (\chi',\phi')(\phi', \psi')(\psi', \chi').\]
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4727:Diamond Point
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