Homogeneity and isotropy of space requisites for kinetic‐energy functional derivatives

@inproceedings{Joubert1994HomogeneityAI,
  title={Homogeneity and isotropy of space requisites for kinetic‐energy functional derivatives},
  author={Daniel P. Joubert},
  year={1994}
}
Homogeneity and isotropy of space lead to two hierarchies of equations for the independent Fermion kinetic‐energy functional Ts[n]. The hierarchies link the mth functional derivative of Ts[n] to the (m+1)th functional derivative. The constraints imposed on Ts[n] are different for nonlocal functionals but equivalent for local functionals. As a consequence of the first hierarchy, Ts[n] can be expressed in terms of any of its functional derivatives.