(2-DIMENSIONAL QED WITH DYNAMICALLY MASSIVE FERMIONS IN VACUUM POLARIZATION(1))

We study chiral symmetry breaking in three-dimensional QED with N-f fl avors of four-component fermions. A closed system of Schwinger-Dyson e quations for fermion and photon propagators and the full fermion-photo n vertex is proposed, which is consistent with the Ward-Takahashi iden tity. A simplified version of that set of equations is reduced (in the nonlocal gauge) to the equation for a dynamical fermion mass function , where the one-loop vacuum polarization with dynamically massive ferm ions has been taken into account. The linearized equation for the ferm ion mass function is analyzed in real space. The analytical solution i s compared with the results of numerical calculations of the nonlinear integral equation in momentum space.