It seems many people even experts don't understand the basic of MWI. In the double slit.. what is wrong with the statement that "that observer will "split" as well--one version of him for each way the double slit experiment came out.". Peterdonis wrote it. And I included it in a thread as reference. But Nugatory stated whether it is based on a solid premise. And I'm getting confused. The environment doesn't split, only the system, yes? So the observer should "split". No? Other synonyms for "split"? How do you use more accurate phrases to describe what happen to the observers in the double slit in MWI?