2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/51592In hep-th/0202087 it was argued that the operator L_0 is bad defined in kappa-basis as a kernel operator. Indeed, we show that L_0 is a difference operator. We also find a representation of L_1 and L_{-1} in a class of difference operators.12 pages, LaTeX 2eHigh Energy Physics - Theorytext