Reduced density matrices 8 Matrix algebra 6 Quantum theory 6 Density matrix 4 Electron correlation 4 reduced density matrices 4 Algebraic structures 2 Analytical model 2 Atoms in molecules 2 Computational methods 2 Correlated wave functions 2 Correlation detectors 2 Correlation effect 2 Cumulant matrices 2 Cumulants 2 Decomposition 2 Dyson equation 2 Electron clouds 2 Electron energy levels 2 Electron population 2 Electronic distribution 2 Electrons 2 Equations of motion 2 Fermi holes 2 First-order 2 Fukui matrices 2 G-particle hole Hypervirial equation method 2 Green's function 2 High transferability 2 Hydrogen aggregates 2