2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/91622This is a set of review notes on combinatorial aspects of Bosonic quantum field theory. We collect together several related issues concerning moments of distributions, moments of stochastic processes and Ito's formula, and Green's functions and cumulant moments in quantum field theory.50 pages, several figures, extended notes with up-dated referencesQuantum Physicstext