Cobos Díaz, FernandoResina, Ivam2023-06-202023-06-2019890024-610710.1112/jlms/s2-39.2.324https://hdl.handle.net/20.500.14352/57285We establish representation theorems in terms of finite rank operators for some operator ideals defined by approximation numbers. We also study the stability under tensor product of these ideals.engjournal articlehttps//doi.org/10.1112/jlms/s2-39.2.324http://jlms.oxfordjournals.org/content/s2-39/2/324.full.pdf+htmlrestricted access517.98Lorentz-Zygmund idealFinite quasi-normApproximation numbersFinite rank operatorsTensor normsTensor stabilityAnálisis funcional y teoría de operadores