2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50064Causal perturbative renormalization within the recursive Epstein-Glaser scheme involves extending, at each order, time-ordered operator-valued distributions to coinciding points. This is achieved by a generalized Taylor subtraction on test functions, which is transposed to distributions. We show how the Epstein-Glaser recursive construction can, by means of a slight modification of the Hopf algebra of Feynman graphs, be recast in terms of the new Connes-Kreimer algebraic setup for renormalization. This is illustrated for $ϕ^4_4$-theory.LaTeX, 34 pages, 8 included figures, Fig.5 has been changed, some improvements and one added referenceHigh Energy Physics - Theorytext