On Mon, Oct 29, 2012  Bruno Marchal <marc...@ulb.ac.be> wrote:

>> We now know that computing or thinking is physical,
> > We don't know that.

We know that as well as we know anything about physics.

> We deduce that in the Aristotelian's theories.

I have no idea what if anything that means.

>> it takes energy to do it and it gives off heat;
> > Actually computation can be made reversibly, without dissipation of
> energy.

With reversible computing you can make the amount of energy used for a
calculation arbitrarily small and thus the heat emitted arbitrarily close
to zero BUT, as I said before, only at the price of slowing down the
computation; we were talking about the theoretical feasibility of making a
prediction and making a forecast of yesterday's weather is not of much use.

  John K Clark

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