On the existence of quantum electrodynamics

We explain from an intuitive renormalization-group perspective how ''collapse of the wave function'' in quenched quantum electrodynamics leads to coupling-constant renormalization and an interacting ultraviolet stable fixed point. A diagrammatic expansion in N/sub f/, the number of fermion species, suggests that vacuum polarization leaves the fixed point of the quenched model stable, and computer-simulation data support this possibility. The scaling region of the quenched lattice model is discovered numerically