> On 20 Jul 2019, at 00:20, John Clark <[email protected]> wrote: > > On Fri, Jul 19, 2019 at 3:14 PM Philip Thrift <[email protected] > <mailto:[email protected]>> wrote: > > >> Do you know of anything simpler that can make calculations than read a > >> square, erase what you read and then print either a 0 or a 1 on it > >> depending on your state, then change into another state depending on what > >> you read, then either halt or move right or left and read another square. > John K Clark > > > Maybe a combinator logic machine: > Common combinators in JavaScript > https://gist.github.com/Avaq/1f0636ec5c8d6aed2e45 > <https://gist.github.com/Avaq/1f0636ec5c8d6aed2e45> > > Where is the physical implementation? JavaScript needs hardware, without > that it's just a sequence of squiggles that can't calculate 2+2. A Turing > Machine IS hardware.
Of course not. The definition given by Turing is that A Turing machine is a quintuplets, but se use simpler quadruplets since, and usually with only two symbols for the tape symbols alphabet. You can see an hardware computer as a abstract immaterial Turing machine implemented in a subset of the physical law, but that does not make the Turing machine notion into a physical notion, only into a physically implementable notion. Bruno > > 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 [email protected] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/everything-list/CAJPayv1XqvOm%2B7g28fCJXZhMGUW9U6hzneqXAp6ziYi%3DFgwt8A%40mail.gmail.com > > <https://groups.google.com/d/msgid/everything-list/CAJPayv1XqvOm%2B7g28fCJXZhMGUW9U6hzneqXAp6ziYi%3DFgwt8A%40mail.gmail.com?utm_medium=email&utm_source=footer>. -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/A3A202EC-A7B2-4531-96BE-D5CC2DA38AFE%40ulb.ac.be.
