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

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