On higher order estimates in quantum electrodynamics.
On the infrared problem in a model of scalar electrons and massless, scalar bosons
On the point limit of the Pauli-Fierz model
On the quantal nature of the Coulomb field
It is shown that the total electric charge, as determined from the Gauss law, is a quantum object. The argument is based on elementary considerations concerning the number of photons, which should be large in a classical situation.
Operator gauge symmetry in QED.