Arazy-Cwikel and Calderón-Mityagin type properties of the couples $({\ell }^p,{\ell }^q)$, $0\le p<q\le \infty$

Sergey V. Astashkin, Michael Cwikel, Per G. Nilsson

We establish Arazy-Cwikel type properties for the family of couples $({\ell }^p,{\ell }^q)$, $0\le p<q\le \infty$, and show that $({\ell }^p,{\ell }^q)$ is a Calderón-Mityagin couple i…