Comment on "Generalization of the Kohn-Sham system that can represent arbitrary one-electron density matrices"

Mario Piris, Katarzyna Pernal

Hubertus J. J. van Dam [Phys. Rev. A 93, 052512, 2016] claims that the one-particle reduced density matrix (1RDM) of an interacting system can be represented by means of a single-d…