Editing Potts model (section)

=== Standard Potts model ===
What is now known as the standard '''Potts model''' was suggested by Potts in the course of his study of the model above and is defined by a simpler Hamiltonian:
: <math>H_p = -J_p \sum_{(i,j)}\delta(s_i,s_j) \,</math>
where <math>\delta(s_i, s_j)</math> is the [[Kronecker delta]], which equals one whenever <math>s_i = s_j</math> and zero otherwise.

The <math>q=2</math> standard Potts model is equivalent to the [[Ising model]] and the 2-state vector Potts model, with <math>J_p = -2J_c</math>. The <math>q=3</math> standard Potts model is equivalent to the three-state vector Potts model, with <math>J_p = -\frac{3}{2}J_c</math>.