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Configurations

To better understand what is meant with a configuration, consider first the case of the one-dimensional Ising model with B=0. In general, a given configuration of N spins in one dimension may look like 123i1ii+1N1N In order to illustrate these features let us further specialize to just two spins.

With two spins, since each spin takes two values only, we have 22=4 possible arrangements of the two spins. These four possibilities are 1=↑↑2=↑↓3=↓↑4=↓↓