2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/228767We propose to treat the $ϕ^4$ Euclidean theory constructively in a simpler way. Our method, based on a new kind of "loop vertex expansion", no longer requires the painful intermediate tool of cluster and Mayer expansions.22 pages, 10 figuresMathematical Physicstext