2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/105914The QCD corrections to photon structure functions are defined in a way consistent with the factorization scheme invariance. It is shown that the conventional DIS$_γ$ factorization scheme does not respect this invariance and is thus deeply flawed. The origins of the divergent behavior of photonic coefficient function at large $x$ are analyzed and recipe to remove it is suggested.14 pages, 2 eps figures, couple of typos and misprints correctedHigh Energy Physics - Phenomenologytext