2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/76970Let T be the quasinilpotent operator on ell_1 without an invariant subspace constructed by C. J. Read in [R3]. We prove that the modulus of this operator has an invariant subspace (and even an eigenvector). This answers a question posed by Y. Abramovich, C. Aliprantis and O. Burkinshaw in [AAB1,AAB3]8 pages, LaTeX2e, to appear in PositivityFunctional Analysis47A15, 47B60, 47B65text