  Supersymmetry, like Poincare symmetry, is softly broken at finite lattice
spacing provided the gaugino mass term is strongly suppressed. Domain wall
fermions provide the mechanism for suppressing this term by approximately
imposing chiral symmetry. We present the first numerical simulations of N=1
supersymmetric SU(2) Yang-Mills on the lattice in four dimensions using domain
wall fermions.
