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Topic: Feedback in Turing Machines
Replies: 17   Last Post: May 29, 2013 12:36 AM

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William Elliot

Posts: 2,637
Registered: 1/8/12
Feedback in Turing Machines
Posted: May 28, 2013 9:38 PM
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On Tue, 28 May 2013, apoorv wrote:
> On May 27, 10:37 am, Graham Cooper <> wrote:
> > On May 27, 2:32 pm, William Elliot <> 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.

> >
> 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

If t0 - t is larger than processing time, then you wouldn't.

However for a second machine to start at time t+1 or some
time t0 when t0 - t is less than processing time, a second
machine can't wait until the output is completed, it has
to be processing the output as is it' coming out.

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