2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/118426We present a set of Bell inequalities that gives rise to a finer classification of the entanglement for tripartite systems. These inequalities distinguish three possible bi-separable entanglements for three-qubit states. The three Bell operators we employed constitute an external sphere of the separable cube.8 pagesQuantum Physicstext