2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/185338The status of various relations among higher order QCD corrections is discussed. In particular, Drell-Levy-Yan relation and Supersymmetric relation are studied at the two-loop level. We have also investigated the validity of such relations for physical observables.3 pages, LaTeX. Contributed to 3rd UK Phenomenology Workshop on HERA Physics, Durham, England, 20-25 Sep 1998High Energy Physics - Phenomenologytext