论文部分内容阅读
We first show relativistic many-body Hamiltonians and wave functions can be expressed systematically with Tracy-Singh products for partitioned matrices,and then derive the electron-electron coalescence conditions for the wave functions of the Dirac-Coulomb,Dirac-Coulomb-Gaunt,and Dirac-Coulomb-Breit Hamiltonians by making use of the internal symmetries of the reduced two-electron systems.