Abstract
We treat several questions related to the positions of subspaces of $\ell_1$. Among them, we show that all quotients $\ell_1/\ell_1$ have the Schur property and that a nontrivial twisted sum of $\ell_1$ and $c_0$ cannot be isomorphic to the direct product $\ell_1 \oplus c_0$.
Citation
Jesus M. F. Castillo. Marilda A. Simoes. "Positions in $\ell_1$." Banach J. Math. Anal. 9 (4) 395 - 404, 2015. https://doi.org/10.15352/bjma/09-4-20
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