Negative resolution of the Feichtinger-Heil-Larson problem on PSD operator factorization in the Feichtinger algebra, plus density and 2-summing characterizations for the operators that succeed.
Okoudjou, Michael Rawson, Yang Wang , and Rui Zhang
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Factorization of positive-semidefinite operators with absolutely summable entries
Negative resolution of the Feichtinger-Heil-Larson problem on PSD operator factorization in the Feichtinger algebra, plus density and 2-summing characterizations for the operators that succeed.