# Talk:Time-dependent density functional theory

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What does mean $\chi(\mathbf{r}_1t_1,\mathbf{r}_2t_2)$ in Linear response TDDFT ? - Could improve comprehension of this part. —Preceding unsigned comment added by 147.33.1.56 (talk) 14:55, 11 June 2009 (UTC) The section "Time-dependent Kohn-Sham system" doesn't make much sense right now- especially the second sentence. "...approaches chooses"?? —Preceding unsigned comment added by 128.253.229.85 (talk) 16:37, 9 November 2009 (UTC)