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Sep 28, 2022 at 21:23 comment added Richard Do you know where I can read about the mathematically rigorous definition of the very first integral expansion in your answer (if $|x\rangle$ had some finite representation as a column vector I would interpret this as an ordinary componentwise integral, however, since this is not the case there is probably some other definition to this)?
Jan 20, 2016 at 21:39 history answered Norbert Schuch CC BY-SA 3.0