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l<sub>∞</sub>-sums and the Banach space l<sub>∞</sub>/ c<sub>0</sub>
This paper is concerned with the isomorphic structure of the Banach space $\ell _\infty /c_0$ and how it depends on combinatorial tools whose existence is consistent with but not provable from the usual axioms of ZFC. Our main global result is that it is