  For interacting electrons in solids, Heisenberg's equation is used to
calculate the distribution in energy of transitions induced by adding an
electron to an atomic-like spin orbital. This is the projected density of
transitions which includes transitions between grounds states, as well as
between other states differing by one electron. The energy of a ground state is
then calculated as the sum of the least energies of transitions starting with
the ground state of no electrons and adding one electron with each transition.
This method is applied to the construction of ground states for a simple model
of the hydrogen molecule, and to interaction effects on the relative cohesion
of HCP and FCC structures of transition metals.
