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A recent paper (Phys. Rev A. 75, 022513 (2007), arXiv:cond-mat/0602020)challenges exact time-dependent density functional theory (TDDFT) on severalgrounds. We explain why these criticisms are either irrelevant or incorrect,and that TDDFT is both formally exact and predictive.

Comment on "Critique of the foundations of time-dependent density functional theory" [Phys. Rev.A. 75, 022513 (2007)]