Aside from his work on the invariant subspace problem, Enflo solved two other major problems—the basis problem and the approximation problem—both of which had remained open for more than 40 years. By ...
Two weeks ago, a modest-looking paper was uploaded to the arXiv preprint server with the unassuming title “On the invariant subspace problem in Hilbert spaces”. The paper is just 13 pages long and its ...
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