DIdn't it arise in the context of EPR and entanglement issues? I'm not sure
of the history, but I think it's well represented by the entanglement
singlet state, namely,
[image: {\displaystyle {\frac {1}{\sqrt {2}}}\left(\left|\uparrow
\downarrow \right\rangle -\left|\downarrow \uparrow \right\rangle \right).}]
IIUC, Einstein asserted that the entangled system must be in either of the
two states in the superposition prior to measurement. But Brent says that
every superposition is an eigenfunction in some basis, which, if true,
would seem to solve, or resolve Einstein's problem with QM; namely, that it
is NON REALISTIC. Consequently, if I have posed the issue correctly, the
question is this; what, precisely, is the basis in which the above singlet
state is an eigenfunction? TIA.
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