2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/125993The density of two {\it initially independent} condensates which are allowed to expand and overlap can show interferences as a function of time due to interparticle interaction. Two situations are separately discussed and compared: (1) all atoms are identical and (2) each condensate consists of a different kind of atoms. Illustrative examples are presented.12 pages, 3 figuresOther Condensed Mattertext