2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16506We investigate the notion of Bose-Einstein condensation of interacting particles. The definition of the condensate is based on the existence of the dominant eigenvalue of the single-particle density matrix. The statistical properties and the characteristic temperature are computed exactly in the soluble models of two interacting atoms.14 pages, 10 figures, final versionCondensed MatterAtomic PhysicsPhysics EducationQuantum Physicstext