apoorv
Posts:
53
Registered:
4/11/13


Re: Feedback in Turing Machines
Posted:
May 28, 2013 9:29 AM


On May 27, 10:37 am, Graham Cooper <grahamcoop...@gmail.com> wrote: > On May 27, 2:32 pm, William Elliot <ma...@panix.com> wrote: > > > > > > > > > > > On Sun, 26 May 2013, apoorv wrote: > > > On May 27, 8:13 am, William Elliot <ma...@panix.com> wrote: > > > > On Sat, 25 May 2013, apoorv wrote: > > > > > Is there some study on situation where the output from a TM at time T is > > > > > fed back so that the total input at time T+1 is some function of output > > > > > at time T and external input at time T+1.? > > > > > So imput is on the right and out on the left and when done at time t, move > > > > the output to the right of the tape and start again. > > > > > Time t+1 begins the new output from the old output. You get to wait until > > > > time t2 for the full second output. > > > > The external input and the output have to be combined > > > So the second TM is necessary? > > > Input 1 on the right side, gives output 1 on the left side. > > When done, imput 1 is erased and output 1 copied to the right side > > where it's now imput 2. Imput 2 is used by the same machine > > to produce output 2 on the left side. > > Starting left and finishing right is just a convention. > > n=1 > TMn  Start left, finish left, signal halt. > n++ > repeat > > Seems there is never an output. > > Herc > www.phpPROLOG.com Eliot's post ,which appears to be deleted, showed that a single TM , could implement feedback. However, if we put the added Requirement that the input at time t is processed with delay not exceeding A fixed time t0, then two TM s appear necessary . Apoorv

