2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49165We study nonlinear effects in the QED ladder Schwinger-Dyson(SD) equation. Without further approximations, we show that all nonlinear effects in the ladder SD equation can be included in the effective couplings and how a linear approximation works well. The analyses is generalized in the case of the improved ladder calculation with the Higashijima-Miransky approximation.7 pages, 2 figuresHigh Energy Physics - PhenomenologyChaotic DynamicsCondensed MatterHigh Energy Physics - Theorytext