Hernández, Francisco L.Ruiz Bermejo, CésarSánchez de los Reyes, Víctor Manuel2023-06-182023-06-182015-110022-247X10.1016/j.jmaa.2015.06.025https://hdl.handle.net/20.500.14352/24094Let I1 and I2 be arbitrary operator ideals in the sense of Pietsch and E and F be Banach spaces such that the set I1(E,F){set minus}I2(E,F) is non-empty. We give a quite general sufficient condition on the Banach spaces in order to obtain the spaceability of I1(E,F){set minus}I2(E,F). Some consequences are provided when considering the ideals of compact operators, strictly singular operators, finitely strictly singular operators and Schatten operator classes.engjournal articlehttp://www.sciencedirect.com/science/article/pii/S0022247X1500579Xhttp://www.sciencedirect.com/restricted access517SpaceabilityOperator idealAnálisis matemático1202 Análisis y Análisis Funcional