2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/178597We provide a fully general-relativistic treatment of cosmological perturbations in a universe permeated by a large-scale primordial magnetic field, using the Ellis-Bruni gauge-invariant formalism. The exact non-linear equations for general relativistic magnetohydrodynamic evolution are derived. A number of applications are made: the behaviour of small perturbations to Friedmann universes are studied; a comparison is made with earlier Newtonian treatments of cosmological perturbations and some effects of inflationary expansion are examined.31 pages, Latex, Submitted to Classical and Quantum GravityGeneral Relativity and Quantum CosmologyAstrophysicstext