[math]\displaystyle{\frac{d\theta_i}{dt} = \omega_i + \lambda_1 \sum_j A_{ij}^{(2)} \sin(\theta_j - \theta_i) + \lambda_2 \sum_{j,k} A_{ijk}^{(3)} \sin(2\theta_j - \theta_k - \theta_i) }[/math] | [math]\displaystyle{\frac{d\theta_i}{dt} = \omega_i + \lambda_1 \sum_j A_{ij}^{(2)} \sin(\theta_j - \theta_i) + \lambda_2 \sum_{j,k} A_{ijk}^{(3)} \sin(2\theta_j - \theta_k - \theta_i) }[/math] |