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8
votes
Rellich-Necas identity
My guessing is that the question is about the so-called Rellich-Necas identity, named after the late Czech mathematician Jindrich NECAS. See e.g. [C24], [C14], and [C11] in http://dml.cz/bitstream/h …
11
votes
1
answer
654
views
Nonseparable Hilbert spaces as quotients of spaces of bounded functions
Is the following result true: the Hilbert space $\ell^{2}\left(2^{\Gamma}\right)$ is a quotient of $\ell^{\infty}\left(\Gamma\right)$ for any
uncountable $\Gamma$ ? [I think it is, but cannot remember …