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 -- You received this message because you are subscribed to the Google Groups "Everything List" group. To post to this group, send email to everything-list@googlegroups.com. To unsubscribe from this group, send email to everything-list+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/everything-list?hl=en.