Russell said...
> In answer to the original question, I would conjecture that an
> evolutionary process is the only process capable of generating
> complexity. Since we need a certain amount of complexity to be
> conscious, it follows that the simplest universes are ensembles of
> possibilities, on which anthropic selection acts to generate the
> needed complexity. Ensemble universes can only evolve by reversible
> processes - otherwise possibilities are irretrievably lost over time.

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Do you think in terms of an ensemble of Turing machines, of which only a
few emulate reversible processes?
So do we have an irreversible computation on a Turing machine emulating
a reversible computation for the universe emulating a brain doing an
irreversible computation?
- David