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- W2019979878 abstract "It is shown that there is an intimate relation between the Hellmann-Feynman theorem and Brillouin's theorem. A more general form of Brillouin's theorem is provided, which applies to excited states of arbitrary symmetry and multiplicity. This new form leads to a simple proof of the Hellmann-Feynman theorem. This theorem is valid when all the orbitals that occur in the wave function are determined by a complete, and not a partial, variational procedure. Arguing in the opposite direction it is shown that the complete satisfaction of the generalized Brillouin's theorem provides an alternative scheme for obtaining the Hartree-Fock orbitals." @default.
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- W2019979878 title "Brillouin's theorem and the Hellmann-Feynman theorem for Hartree-Fock wave functions" @default.
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- W2019979878 doi "https://doi.org/10.1080/00268977100100651" @default.
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