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Square lattice Ising model susceptibility: series expansion method and differential equation for χ<sup>(3)</sup>
In a previous paper (2004 J. Phys. A: Math. Gen. 37 9651–68) we have given the Fuchsian linear differential equation satisfied by χ(3), the 'three-particle' contribution to the susceptibility of the isotropic square lattice Ising model. This paper gives the details of the calculations (with some useful tricks and tools) …