2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/87305This review article deals with some case studies of relativistic and correlation effects in atomic systems. After a brief introduction to relativistic many-electron theory, a number of applications ranging from correlation energy to parity non-conservation in atoms are considered. There is a special emphasis on relativistic coupled-cluster theory as most of the results presented here are based on it.Review article, 4 eps figures, latex 2eAtomic PhysicsChemical PhysicsComputational Physicstext