Multiverse/fungibility

On BoI someone recommended this book
http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199546961.0\
01.0001/acprof-9780199546961
<http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199546961.\
001.0001/acprof-9780199546961>

I looked at the chapters and didn't see anything about fungibility...and
I guess Deutsch.

I don't think MWI is correct, but....what do I do see is that his -
Deutsch's - realization about fungibility is the most important and
reasoned idea within MWI. You have to have it. You can't explain the
wave-function as it is before it is interupted without fungibility.

Not wanting to teach people to suck eggs but clearly, if you go down a
thousand metres into granite, all on your own, and set up a little
science lab and do the two-slit experiment. If you are seeing an
interuption, and if the explanation is going to be MWI-esque, then there
has to be a multiverse of other worlds, identical enough,  that someone
just like you, just went 1000 metres into granite with the same  just
the same kit and just the same ideas...such that he just did that same
experiment in the same instance such that you all get the wave function.

Yet it doesn't get mentioned by other proponents of the theory. Weird.



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