On 8/8/2019 1:50 AM, Bruno Marchal wrote:
Except in the case of quantum mechanics the theory you are saying predicts 
other worlds, also predicts they are inaccessible.
That is right, but the theory predicts that they are indirectly playing an 
important role without which QM explains nothing.

But this is quite different from classical theories, that for example the dark side of the Moon exists.  In that case the theory also predicts that it is possible to go to the dark side of the Moon.   A theory that predicts X but also that X is inaccessible and has no possible effect is a theory that could discard X.

Brent

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