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when toggle format what by license comment
Dec 3, 2016 at 20:45 history edited anonymous CC BY-SA 3.0
The answer is of course "yes" on 1-dimensional real Hilbert spaces.
Dec 3, 2016 at 20:25 history edited Denis Serre CC BY-SA 3.0
added 4 characters in body
Dec 3, 2016 at 20:21 history edited anonymous CC BY-SA 3.0
Less sloppy notation
Dec 3, 2016 at 20:11 history answered anonymous CC BY-SA 3.0