2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/111926We discuss the derivation of master equations in the presence of initial correlations with the reservoir. In van Hove's limit, the total system behaves as if it started from a factorized initial condition. A proper choice of Nakajima-Zwanzig's projection operator is crucial and the reservoir should be endowed with the mixing property.10 pages; Contribution to the Proceedings of TQMFA05, Palermo, 2005Quantum Physicstext