2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45048In order to investigate the nature of the phase transition, we study the finite temperature effective potential for the $λΦ^4$ theory in the Hartree-Fock approximation, which sums up all the daisy and superdaisy diagrams.LaTex + epsf, 10 pages, 3 figures included, to appear in the Proceedings of the III Workshop on Thermal Field Theories and Their Applications, Banff, Canada, August 15-27, 1993, MIT-CTP-2255, BU-HEP-93-26High Energy Physics - Phenomenologytext