  Calculations in a (3+1)-dimensional model indicate that Pauli-Villars
regularization can be combined with discrete light-cone quantization (DLCQ) to
solve at least some field theories nonperturbatively. Discrete momentum states
of Pauli-Villars particles are included in the Fock basis to automatically
generate needed counterterms; the resultant increase in basis size is found
acceptable. The Lanczos algorithm is used to extract the lowest massive
eigenstate and eigenvalue of the light-cone Hamiltonian, with basis sizes
ranging up to 10.5 million. Each Fock-sector wave function is computed in this
way, and from these one can obtain values for various quantities, such as
average multiplicities and average momenta of constituents, structure
functions, and a form-factor slope.
