  In this article we explore the R-symmetry of the (2,2) 2d Wess-Zumino model.
We study whether or not this symmetry is approximately realized in the Q-exact
lattice version of this theory. Our study is nonperturbative: it relies on
Monte Carlo simulations with dynamical fermions. Irrelevant operators in the
lattice action explicitly break the R-symmetry. In spite of this, it is found
to be a symmetry of the effective potential. We find nonperturbative evidence
that the nonrenormalization theorem of the continuum theory is recovered in the
continuum limit; e.g., there is no additive mass renormalization. In our
simulations we find that Fourier acceleration of the hybrid Monte Carlo
algorithm allows us to avoid difficulties with critical slowing-down.
