- E(\mu_j,\mu_k) & \equiv - \sum_{i=1}^N S_{i,j} S_{i,k} \\
- E(\mu_j) & \equiv - J \sum_{i=1}^N S_{i,j} S_{i+1,j} - \mu B_0 \sum_{i,j} S_j \\
- \mu_j & \equiv \{S_{1,j},\ldots,S_{N,j}\}
+ \displaystyle E(\mu_j,\mu_k) & \displaystyle \equiv - \sum_{i=1}^N S_{i,j} S_{i,k} \\[2mm]
+ \displaystyle E(\mu_j) & \displaystyle \equiv - J \sum_{i=1}^N S_{i,j} S_{i+1,j} - \mu B_0 \sum_{i,j} S_j \\[2mm]
+ \displaystyle \mu_j & \displaystyle \equiv \{S_{1,j},\ldots,S_{N,j}\}