2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77755Crystal tensor operators, which tranform under U_q->0(sl(2)), in analogous way as the vectors of the crystal basis, are introduced. The Wigner-Eckart theorem for the crystal tensor is defined: the selection rules depend on the initial state and on the component of the tensor operator; the transition amplitudes to the states of the same final irreducible representation are all equal.11 pages, Latex file, no figuresQuantum AlgebraMathematical Physicstext