Clarification and correction are given of Perrot’s 1979 development of the free energy of the
weakly inhomogeneous electron gas. Related corrections in Fromy et al. (1996) are given, along
with connections to Furutani et al. (1986).
Nuclear Site Singularity in the Functional Derivative
of the von Weizsäcker KE
The functional derivative of the von Weizsäcker KE has a singularity at the nuclear site for an
atomic density consistent with the Kato cusp condition.
Su-Goddard Electron Force Field and Car-Parrinello Dynamics
