SEARCH Articles Figures Tables Atom density matrix formalism Centroid density formalism Density Matrix Approach Linking Path Integral Formalism Density functional formalism Density functional theory formalism Density matrix formalism Density operator formalism Formal Development of Density Functional Theory Lineshape density matrix formalism Local density approximation formalism Local density formalism Nonlocal density functional formalism Orbital-Density Formalism Phase-space density formalism Reduced-density-matrix formalism Relativistic Density Functional Theory Foundations and Basic Formalism The density-functional formalism The structure factor formalism in terms of atomic densities Time-dependent local density formalism Valence density formalism