On 10/18/2013 12:42 AM, Jason Resch wrote:

But that's not compatible with Bruno's idea of eliminating the physical - at least not unless he can solve the basis problem.Could you do me a favor and explain what the basis problem is in a way that a 6th gradercould understand? I've found all kinds of things said on it, and they all seem to beasking different things.

`For physicists, it's part of the problem of explaining the emergence of the classical`

`world from the quantum world. Decoherence can diagonalize (approximately) a reduced`

`density matrix IN SOME BASIS. Being diagonal in one basis means it's superposition in`

`some other basis. So for physicists the problem is saying what privileges or picks out`

`the particular bases we see in experiments. Why do our instruments have needles that are`

`in eigen states of position, while some other things (e.g. atoms) are in eigen states of`

`energy or eigen states of momentum. For physicists there are some suggestive, but not`

`fully worked out answers to these questions, e.g. you get position eigenstates because the`

`interaction term of the Hamiltonian is a function of position. But those answers assume`

`the physics. If you want to reconstruct physics from experiences, you can't borrow the`

`physical explanation to say why your experiences are classical.`

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