2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/133126We present quantum stochastic calculus in terms of diagrams taking weights in the algebra of observables of some quantum system. In particular, we note the absence of non-time-consecutive Goldstien diagrams. We review recent results in Markovian limits in these terms.14 pages, multiple embedded latex picturesQuantum Physicstext