You can’t get the probabilities from those suppositions. And without the probabilities, MWI has no predictive power; it’s just a metaphysics which says “Everything that can happen does happen”, and which then gives wrong predictions if you count the worlds the way you would count anything else.
Sorry, yes. I took weighting things by squared-norm of amplitude as implicit, seeing as we’re discussing QM in the first place.
Sorry, yes. I took weighting things by squared-norm of amplitude as implicit, seeing as we’re discussing QM in the first place.