Also, if MWI hypothesis is true, there's no way for one branch to interact with another later, right?
Basically, if two of them evolve into the same "world", they interfere. It could be constructive or destructive. It averages out to be that it occurs as often as you'd expect, so outside of stuff like the double-slit experiment, they won't really interact.
Hmm. I'm also pretty sure that the double-slit experiments are not evidence of MWI vs. waveform collapse.
From Costanza's original thread (entire text):
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