On Sat, Nov 10, 2018 at 1:09 AM Bruno Marchal <marc...@ulb.ac.be> wrote:
> Any Turing machine can emulate any Turing complete subset of physics. You've got it backwards, physics can simulate a Turing Machine but a Turing Machine can't simulate anything or do anything at all without the help of matter that obeys the laws of physics. > >>> *mathematical models and realities are quite different from the >>> language used to describe them.* >> >> > > >> That is equivalent to saying "The English word "cat" is quite >> different from the English word "cat" “. >> > > *> ?* > ! A mathematical model is a description of something written in the language of mathematics, like most descriptions it is not complete, some details have been left out and that's why a toy model of a battleship is simpler than a real physical battleship. A mathematical model of another mathematical model can be complete but not of something physical. John K Clark -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to email@example.com. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.