Correlation matrix 8 Correlation detectors 6 Electronic correlation effects 6 Reduced density matrix 6 Schrodinger equation 6 Contracted Schrödinger equation 4 Contracted schrodinger equation 4 Correlation methods 4 Dinger equation 4 G-matrix 4 Mathematical operators 4 Quantum theory 4 Reduced-density matrix 4 contracted Schrödinger equation 4 correlation matrix 4 electronic correlation effects 4 reduced density matrix 4 Activation energy 2 Anti-hermitian contracted schrödinger equation 2 Antihermitian contracted Schrödinger equation 2 Beryllium 2 Computational efficiency 2 Contracted Schrodinger equation 2 Equations of state 2 Exact solution 2 Excited states 2 Fourth order 2 G-particle-hole matrix 2 Hamiltonians 2 Mathematical models 2