  Some time ago Kaplan proposed a new model for the description of chiral
fermions on the lattice by adding an extra dimension for the fermions. A
variant of this proposal was introduced by Shamir and can be used to describe
vector-like theories in even dimensions. We used this model for the simulation
of the massive Schwinger model at different gauge couplings. The prediction
that the fermion mass gets only multiplicative renormalization was tested and
verified.
