On 5/9/2025 3:06 PM, John Clark wrote:


On Fri, May 9, 2025 at 4:10 PM Brent Meeker <[email protected]> wrote:

    /> Are there multiple worlds with zero probabilities?/


*I can't answer that question until you answer a question of my own. Zero probability of what? And if your answer is "of being observed" then my next question is "being observed by who?"*
No, if you measure a variable A in a world it was just measure to have the eigenvalue Ao, then MWI says you are in a world with A=Ao with probability 1.0  Yet you wrote that "Many Worlds says it was in every state that is not forbidden by Schrodinger's Equation."  The system is not forbidden by Schrodinger's equation to be in other states Ai; it is a contingent fact that it happened, in this world, to land in state Ao the first time it was measured.  So it has probability zero of being a world where A=Ai.  This has nothing to do with being observed or by whom unless you think consciousness is necessary for measurement.

Brent
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***John K Clark    See what's on my new list at Extropolis <https://groups.google.com/g/extropolis>*
\0o





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