"David Elieser Deutsch", Royal Society#Fellows/FRS is a United Kingdom/British physicist at the University of Oxford. He is a non-stipendiary Visiting Professor in the Department of Atomic and Laser Physics at the Centre for Quantum Computation (CQC) in the Clarendon Laboratory of the University of Oxford. He pioneered the field of quantum computation by formulating a description for a quantum Turing machine, as well as specifying an algorithm designed to run on a quantum computer.

Also available [http://www.ceid.upatras.gr/tech_news/papers/quantum_theory.pdf here.] Abstract available [http://adsabs.harvard.edu/abs/1985RSPSA.400...97D here.] He is a proponent of the many-worlds interpretation of quantum mechanics.

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The next chapter is likely to provoke many mathematicians. This can't be helped. Mathematics is not what they think it is.

The overwhelming majority of theories are rejected because they contain bad explanations, not because they fail experimental tests.

As I understand it, the claim is that the less you use Homeopathy, the better it works. Sounds plausible to me.

Surely it is more interesting to argue about what the truth is, than about what some particular thinker, however great, did or did not think.

Time travel may be achieved one day, or it may not. But if it is, it should not require any fundamental change in world-view, at least for those who broadly share the world view I am presenting in this book.

The theory of computation has traditionally been studied almost entirely in the abstract, as a topic in pure mathematics. This is to miss the point of it. Computers are physical objects, and computations are physical processes. What computers can or cannot compute is determined by the laws of physics alone, and not by pure mathematics.

The quantum theory of parallel universes is not the problem, it is the solution. It is not some troublesome, optional interpretation emerging from arcane theoretical considerations. It is the explanation, the only one that is tenable, of a remarkable and counter-intuitive reality.

The truly privileged theories are not the ones referring to any particular scale of size or complexity, nor the ones situated at any particular level of the predictive hierarchy, but the ones that contain the deepest explanations.

I myself believe that there will one day be time travel because when we find that something isn't forbidden by the over-arching laws of physics we usually eventually find a technological way of doing it.