  We study dynamical supersymmetry breaking and the transition point by
non-perturbative lattice techniques in a class of two-dimensional N=1
Wess-Zumino model. The method is based on the calculation of rigorous lower
bounds on the ground state energy density in the infinite-lattice limit. Such
bounds are useful in the discussion of supersymmetry phase transition. The
transition point is determined with this method and then compared with recent
results based on large-scale Green Function Monte Carlo simulations with good
agreement.
