Cecil comments on No Individual Particles - Less Wrong
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Hey Eliezer, your explanations are incredible but I don't understand why we are folding the amplitude distribution over that diagonal line. I do understand that the folded distribution is unfactorable, but what is the motivation behind the folding operation?
I believe the idea here is that because particle A and B are indistinguishable, the probability assigned to the case where particle A is "before" B can be equivalently assigned to the opposite case.
In the same manner that a train schedule with cities across the top and side needs only one entry per cityA / cityB pairing.
I see