SEARCH Articles Figures Tables Density operator Dirac Dirac Equation Operator Dirac Hamiltonian operators Dirac delta operator Dirac spin operator Dirac-Coulomb-Breit operator Fock-Dirac density operators Fock-Dirac operator Four-component Dirac operator Kinetic energy Dirac operator Momentum space eigenvectors of the Dirac operator Operators Dirac-Coulomb Operators commuting with the Dirac operator Operators free-particle Dirac energy Partial Wave Dirac Operator Properties of Dirac Operators Resolvent of the Dirac Operator Spin-orbit operators Dirac-Fock equations The Dirac Operator Velocity Dirac operator