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when toggle format what by license comment
Mar 13, 2023 at 17:30 comment added Carlo Beenakker the calculation in my answer was for $u\neq 0$, I do think that is complete without delta functions; I added the case $u=0$, where a delta function of $|v|$ appears.
Mar 13, 2023 at 15:30 history answered memorial CC BY-SA 4.0