Hernández, Francisco L.Sánchez de los Reyes, Víctor ManuelSemenov, Evgeny M.2023-06-202023-06-2020010039-322310.4064/sm144-3-2https://hdl.handle.net/20.500.14352/57903The authors wish to thank the referee for his suggestions and detailed remarks.It is studied when inclusions between rearrangement invariant function spaces on the interval [0, infinity) are disjointly strictly singular operators. In particular suitable criteria, in terms of the fundamental function, for the inclusions L 1 ∩L ∞ ↪E and E↪L 1 +L ∞ to be disjointly strictly singular are shown. Applications to the classes of Lorentz and Marcinkiewicz spaces are given.engjournal articlehttps://bit.ly/2N3hVnmhttp://journals.impan.gov.pl/sm/index.htmlrestricted access517.98Rearrangement invariant function spacesInclusion operatorStrictly singularWeakly compactLorentz and Marcinkiewicz spacesAnálisis funcional y teoría de operadores