Mathematics – Logic
Scientific paper
2009-08-13
Mathematics
Logic
The main result of the note has been known. See Orthonormal bases and quasi-splitting subspaces in pre-Hilbert spaces D. Buhag
Scientific paper
I prove that a Hilbert space has the property that each of its dense (not
necessarily closed) subspaces contains an orthoormal basis if and only if it is
separable.
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