2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/64343Using the theory of corings, we generalize and unify Morita contexts introduced by Chase and Sweedler, Doi, and Cohen, Fischman and Montgomery. We discuss when the contexts are strict. We apply our theory corings arising from entwining structures, and this leads us to the notion of cleft entwining structure.27 pagesRings and AlgebrasQuantum Algebra16W30text