2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/215345When initially-independent subsystems are made to contact, {\it coherence} can develop due to interaction between them. We exemplify and demonstrate this paradigm through several scenarios of two initially-independent Bose-Einstein condensates which are allowed to collide. The build-up of coherence depends strongly on time, interaction strength and other parameters of each condensate. Implications are discussed.11 pages, 3 figuresOther Condensed MatterQuantum Physicstext