2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47165We argue three-flavour neutrino mixing. We consider the neutrinos as Majorana particles and see how the neutrinoless double beta decay constrains the neutrino mixing angles. Our formulation is widely valid and is applied to the neutrino oscillation experiment.14pp, LaTeX, 5 EPS FiguresHigh Energy Physics - Phenomenologytext