2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/182532It is proven by explicit construction that regularization by dimensional reduction can be formulated in a mathematically consistent way. In this formulation the quantum action principle is shown to hold. This provides an intuitive and elegant relation between the D-dimensional Lagrangian and Ward or Slavnov-Taylor identities, and it can be used in particular to study to what extent dimensional reduction preserves supersymmetry. We give several examples of previously unchecked cases.19 pages, 4 figures; minor modifications, published in JHEPHigh Energy Physics - Phenomenologytext