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Boundary Conditions

Generally use periodic boundary conditions, where the lattice wraps around on itself to form a torus. This has been shown to give the smallest finite size effects.

But then must be careful that in measuring the correlation function, can only take measurements to for a lattice of size L, since a distance n is equivalent to a distance on a lattice that wraps around on itself.

Paul Coddington, Northeast Parallel Architectures Center at Syracuse University,