DERIVATION OF LOW-TEMPERATURE EXPANSIONS FOR ISING MODEL-X - 4-DIMENSIONAL SIMPLE HYPERCUBIC LATTICE

For Pt.IX see ibid., vol.8, p.1461 (1975). The derivation of high-field expansions for the four-dimensional simple hypercubic lattice is described briefly. The high-field polynomials Ln are given up to L15 together with the complete partial generating functions (codes) up to F 7 which determine the corresponding sub-lattice polynomials. Expansions are given for the zero-field free energy and initial susceptibility in powers of the high-temperature counting variable nu =tanh K up to nu 17, and combined with the codes these determine the susceptibility and all its field derivatives up to nu 17.