2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/51255We outline the proofs of several principal statements in conventional renormalization theory. This may be of some use in the light of new trends and new techniques (Hopf algebras, etc.) recently introduced in the field.AMSLaTeX, 5 pages, no figures. Other notes and updates are available at http://thsun1.jinr.ru/~alvladim/qft.htmlHigh Energy Physics - Theorytext