It gives you the correct probabilities for your future observations, as long as you normalize whatever you have observed to one. The difference from Copenhagen is that in Copenhagen there is a singular past which actually is measure 1.0.
Now what’s difficult is figuring out the role of measure in branches which have fully decohered, so that they can no longer observe each other. Wether an “Everett branch” is such a branch is unknown .
It gives you the correct probabilities for your future observations, as long as you normalize whatever you have observed to one. The difference from Copenhagen is that in Copenhagen there is a singular past which actually is measure 1.0.
Now what’s difficult is figuring out the role of measure in branches which have fully decohered, so that they can no longer observe each other. Wether an “Everett branch” is such a branch is unknown .