2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/211955We propose the another, in principe nonperturbative, method of the evaluatiom of the Wiener functional integral for "phi^4" term in the action. We find the "generalized" Gelfand-Yaglom differential equation implying the functional integral in the continuum limit.We clarify the proofs of the formulas, add a discussions of the mathematical stepsHigh Energy Physics - Theorytext