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Sep 30, 2017 at 21:27 comment added Taras Banakh What about compact subsets of a Hilbert space? There exists a simple example of a 4-element metric space that does not embed to a Hilbert space.
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Sep 29, 2017 at 13:17
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Sep 29, 2017 at 13:09
Sep 29, 2017 at 12:42 history answered loire CC BY-SA 3.0