2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/82215Relations between nonrelativistic and relativistic two-body equations, also allowing for different masses, are studied and explicit expressions are given. One example is the Blankenbeclar Sugar equation. The corresponding expressions for the boosted two-body potentials are provided.5pages, no figure, no tableNuclear Theorytext