2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/29531Calculation of thermodynamic functions of the three-dimensional Ising ferromagnet above and below critical temperature is performed in the approximation of sixfold basis distribution ($ρ^6$ model). Comparison with the results for the $ρ^4$ model indicates that dependence of the thermodynamic functions on the renormalization group parameter $s$ becomes weaker. The optimal interval of the renormalization group parameter values is determined.LaTeX, 41 pages, 9 eps figures, 10 tablesStatistical Mechanicstext