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Uniqueness conjecture for nontrivial self-similar twisted Hilbert spaces
A twisted Hilbert space is a twisted sum of two copies of the Hilbert space $\ell_2$ , and it is self-similar when it is isomorphic to each of its infinite-dimensional closed subspa…
Conjectureopenfunctional-analysis isomorphism-problems twisted-hilbert-spacesarXiv posted 2 days ago

Uniqueness conjecture for nontrivial self-similar twisted Hilbert spaces