On 06 Oct 2013, at 19:03, meekerdb wrote:

On 10/6/2013 12:43 AM, Bruno Marchal wrote:

On 05 Oct 2013, at 19:55, John Clark wrote:

On Sat, Oct 5, 2013 at 12:28 PM, Bruno Marchal <marc...@ulb.ac.be> wrote:

> you have agreed that all "bruno marchal" are the original one (a case where Leibniz identity rule fails,

If you're talking about Leibniz Identity of indiscernibles it most certainly has NOT failed.

I was talking on the rule:

a = b
a = c
entails that b = c

The M-guy is the H-guy  (the M-guy remembers having been the H-guy)
The W-guy is the H-guy  (the W-guy  remembers having been the H-guy)
But the M-guy is not the W-guy (in the sense that the M-guy will not remember having been the W-guy, and reciprocally).

The rest are unconvincing rhetorical tricks, already answered, and which, btw, can be done for the quantum indeterminacy, as many people showed to you. Each time we talk about the prediction the "he" refer to the guy in Helsinki before the duplication, after the duplication, we mention if we talk of the guy in M or in W, or of both, and look at their individual confirmation or refutation of their prediction done in Helsinki. We just look at diaries, and I have made those things clear, but you talk like if you don't try to understand.

There is nothing controversial, and you fake misunderstanding of the most easy part of the reasoning. Not sure what is your agenda, but it is clear that you are not interested in learning.

Well there is still *some* controversy; mainly about how the indeterminancy is to be interpreted as a probability. There's some good discussion here, http://physics.stackexchange.com/questions/20802/why-is-gleasons-theorem-not-enough-to-obtain-born-rule-in-many-worlds-interpret especially the last comment by Ron Maimon.

I was talking on the arithmetical FPI, or even just the local probability for duplication protocol. This has nothing to do with QM, except when using the MWI as a confirmation of the mùany dreams.

Having said that I don't agree with the preferred base problem. That problem comes from the fact that our computations can make sense only in the base where we have evolved abilities to make some distinction. The difficulty is for physicists believing in worlds, but there are only knowledge states of observer/dreamers.

But I insist, here, what I said was not controversial is that in the WM duplication thought experience, *with the precise protocol given*, we have an indeterminacy, indeed even a P = 1/2 situation. The quantum case is notoriously more difficult (due indeed to the lack of definition of "world"), but it seems to me that Everett use both Gleason theorem + a sort of FPI (more or less implicitly).



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