A spacetime lattice can be viewed a

A spacetime lattice can be viewed as a nonperturbative regularization. Since the other knownregularizations, like dimensional regularization or Pauli- -Villars, can be defined only order by orderin perturbation theory, the lattice regularization has this unique advantage over them. It is a regular-ization which is not tied to any specific approximation method, and which allows calculations fromfirst principles employing various numerical and analytical methods, without any need to introducemodels for the physics or additional parameters.