2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/100505A previously tested differential equation method for generating low temperature series expansion for diagonal spin-spin correlation functions in the d=2 Ising model is extended to generate the non-universal terms for arbitrary separation of the spins. This extends the earlier calculations of these correlation functions.7 pages, no figuresStatistical MechanicsOn the low temperature series expansion for the diagonal correlation functions in the two-dimensional Ising modeltext