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Reading a paper I came across this abomination of a notation, my question is, how do I interpret it?

For context I'll post the whole page + the notation as a separate.

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The notation in mind is this weird summation-integral from P to B

How am I supposed to read that?

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  • $\begingroup$ @user190081 That should be an answer $\endgroup$ – David Z Sep 11 '18 at 22:30
  • $\begingroup$ May I ask what equation B1 is as it seems to be the definition of the integral, just curious as why that wasn't mention in the original post $\endgroup$ – Triatticus Sep 12 '18 at 5:49
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Not sure if this is the case, but according to this question, it is a sum over all discrete states and an integral over all continuum states.

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