Ising model susceptibility: Fuchsian differential equation for ${\chi }^{(4)}$ and its factorization properties

N. Zenine, S. Boukraa, S. Hassani +1

We give the Fuchsian linear differential equation satisfied by ${\chi }^{(4)}$, the ``four-particle'' contribution to the susceptibility of the isotropic square lattice Ising model. This…