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Hi, I've read from Wikipedia that in the Hartree-Fock approximation, "Each energy eigenfunction is assumed to be describable by a single Slater determinant".

My question is... if the approximation fails and the system has to be described by linear combinations of more than one type of Slater determinants, what type of wave functions would they be determinants of? (besides the one-electron wave functions)

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# When does the Hartree-Fock approximation fail?

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