JCP paper out

Some of my work on the Runge-Gross theorem (the Hohenberg-Kohn theorem of TDDFT) was published this morning (JCP, 147, 134110). This theorem states that the time-dependent electronic density determines the potential uniquely (up to a constant), so we can define observables as time-dependent density-functionals. This manuscript extends the theorem to include time-dependent densities and potentials that are not Taylor expandable with respect to time. The Supp Info includes an alternative method, and an application to time-dependent current-density functional theory.