Generalized Gradient Approximation Made Simple [Phys. Rev. Lett. 77, 3865 (1996)]

@article{Perdew1997GeneralizedGA,
  title={Generalized Gradient Approximation Made Simple [Phys. Rev. Lett. 77, 3865 (1996)]},
  author={John P. Perdew and Kieron Burke and Matthias Ernzerhof},
  journal={Physical Review Letters},
  year={1997},
  volume={78},
  pages={1396-1396}
}
For the molecules Be2, F2, and P2 of Table I, the unrestricted Hartree-Fock solution breaks the singlet spin symmetry, even though the density-functional solutions do not. For these broken-symmetry solutions, the UHF atomization energies become 17, 220, and 141 kcalymol, respectively, and the mean absolute error of all the UHF atomization energies becomes 69.8 kcalymol. The PBE correlation energy of the two-electron ions of nuclear charge Z ! ` should be corrected to 20.0479 hartree, consistent… 

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