2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/57247Using new generalized Landen transformations, we prove that the solutions of the KdV and other nonlinear equations obtained recently by using a kind of superposition principle for periodic solutions are in fact novel re-expressions of well known periodic one soliton solutions.4 pages, 0 figuresMathematical Physicstext