constant3 comments on Many Worlds, One Best Guess - Less Wrong
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Remember, that-which-exists at any moment does not just consist of a set of worlds, but a set of worlds each with a complex number attached. And that-which-exists in the next moment is - the same set of worlds, but now with different complex numbers attached.
You seem to be talking about the wavefunction, which is a complex function defined over the configuration space (a set of configurations each with a complex number attached). But in that case you seem to be confusing a world with a configuration. A configuration defines only position. (Assuming we're talking about positional configuration space.)
It seems I can save myself some trouble explaining by quoting Eliezer:
If Conway's Game of Life managed to support a multiverse, then a single universe in this multiverse would not correspond to a cell. It would correspond to some section of the whole pattern quite a bit larger than a single cell - a section which was for the most part causally separated from the rest of the pattern. And this section might move around over Conway's gameboard (or whatever it's called), just as a glider can move across Conway's gameboard.