2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/117755With a mathematical eye to Matt Visser's multihistory approach to the time-travel-paradoxes of General Relativity, a non relativistic toy model is analyzed in order of characterizing the conditions in which, in such a toy model, causation occurs.Mathematical PhysicsGeneral Relativity and Quantum Cosmologytext