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Jul 11, 2011 at 19:59 history edited Jeff Schenker CC BY-SA 3.0
Corrected the statement as to what the domain of $\sqrt{-L}$ is.
Jul 6, 2011 at 18:09 comment added Helge The BC described at the beginning is not crazy. It represents an operator interpolating between periodic and anti-periodic boundary conditions.
Jul 6, 2011 at 17:09 history answered Jeff Schenker CC BY-SA 3.0