Talk:Invariant subspace problem: Difference between revisions

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Rumours of a solution
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}} The mathematical problem has been solved.. by a team of Arab mathematicians from Jordan.. on 8/21/2024
 
==Problem vs. conjecture==
 
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==Hilbert space case solved?==
It is rumoured that Carl Cowen (Purdue) and Eva Gallardo-Gutiérrez (Madrid) have solved the Hilbert space case. The only evidence, so far, [https://twitter.com/RSME2013/status/294785891984101376/photo/1 is this picture]. We'll just have to wait for a preprint. [[User:Hanche|Hanche]] ([[User talk:Hanche|talk]]) 06:53, 28 January 2013 (UTC)
:Ah, but [http://cafematematico.com/2013/02/05/statement-from-cowen-and-gallardo/ there was a gap]. [[User:Hanche|Hanche]] ([[User talk:Hanche|talk]]) 14:20, 17 February 2013 (UTC)
 
==Second Bullet of "Known Special Cases" Needs Citation==
While the fact is obvious to experts in the field, talk of even any topological vector spaces that are not separable is extremely rare in the literature. I feel like the author had a precise source or straightforward inspired origin for the statement. The source making the remark or the inspiration for it should be cited accordingly. [[User:MMmpds|MMmpds]] ([[User talk:MMmpds|talk]]) 02:28, 13 April 2019 (UTC)
 
== Solved for Hilbert spaces ==
 
Per Enflo just [https://arxiv.org/pdf/2305.15442.pdf published a proof], should this be added? — [[User:SourceIsOpen|SourceIsOpen]] ([[User talk:SourceIsOpen|talk]]) 13:16, 28 May 2023 (UTC)