Ising model | \(\{-1,1\}\) | ℤ/2ℤ | \(0\cdot s\mapsto s\) \(1\cdot s\mapsto-s\) | \(s\times t\) | \(Hs\) |
Order-\(n\) model | \(S^n\) | \(\mathop{\mathrm{O}}(n)\) | \(O\cdot s\mapsto Os\) | \(s^{\mathrm T}t\) | \(H^{\mathrm T}s\) |
Potts model | {0,…,q – 1} | Dq | Rotation & reflection of polygon vertices | \(\delta(s,t)\) | \(\sum_mH_m\delta(m,s)\) |
Clock model | {0,…,q – 1} | Dq | Rotation & reflection of polygon vertices | \(\cos(2\pi\frac{s-t}q)\) | \(\sum_mH_m\cos(2\pi\frac{s-m}q)\) |