2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/145330The exact partition function of the two-dimensional nearest neighbour Ising model pertaining to square lattices is derived for N sites in the case of a non-vanishing magnetic field.When the magnetic field is zero,the partition functions estimated from the present analysis are identical with those arising from Onsager's exact solution.5 pages;1FigureStatistical Mechanicstext