Re: Juergen's paper

From: Russell Standish <>
Date: Wed, 23 Jan 2002 12:24:24 +1100 (EST)

H J Ruhl wrote:
> I have the following question regarding Juergen's paper:
> In the very first sentence of the abstract it is assumed that universes
> have histories. If by this it is meant that a particular universe has a
> particular unique identifiable history does this not mean that that
> universe is computable?

Why should it? It seems a universe's history is the only property a
universe can have, ie universes are histories. There are plenty of
noncomputable descriptions that can serve as histories - for example
the binary expansion of Chaitin's Omega.

> How would one associate a universe with its
> history unless you could check it backwards to the initial state and then
> forwards to the current state? Would that not require a
> computation? Would it not require the lack of even a pseudorandom noise
> content to the rules of evolution for that universe?
> Hal Ruhl

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Received on Tue Jan 22 2002 - 17:34:34 PST

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