2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/217627To study the infrared behaviour of the propagator, exponentiation of the lowest order spectral function has been known.We show this method is helpful in super renormalizable theory with dimension-full coupling constant.In the 1/N approximation anomalous dimension is independent of $N$,which plays an important role for confinement and pair condensation.6 pages Latex,2 figures.introduction is modified.mistakes in equations are corrected.figure captions are correctedHigh Energy Physics - Theorytext