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On 10/30/2024 5:07 AM, Mikko wrote:And thus is no longer a UTM, so doesnt have the [properties of UTM.On 2024-10-29 13:56:19 +0000, olcott said:In other words you are saying that there is no such thing as a
>On 10/29/2024 2:57 AM, Mikko wrote:>On 2024-10-29 00:57:30 +0000, olcott said:>
>On 10/28/2024 6:56 PM, Richard Damon wrote:>On 10/28/24 11:04 AM, olcott wrote:>On 10/28/2024 6:16 AM, Richard Damon wrote:>The machine being used to compute the Halting Function has taken a finite string description, the Halting Function itself always took a Turing Machine,>
>
That is incorrect. It has always been the finite string Turing Machine
description of a Turing machine is the input to the halt decider.
There are always been a distinction between the abstraction and the
encoding.
Nope, read the problem you have quoted in the past.
>
Ultimately I trust Linz the most on this:
>
the problem is: given the description of a Turing machine
M and an input w, does M, when started in the initial
configuration qow, perform a computation that eventually halts?
https://www.liarparadox.org/Peter_Linz_HP_317-320.pdf
>
Ĥ.q0 ⟨Ĥ⟩ ⊢* embedded_H ⟨Ĥ⟩ ⟨Ĥ⟩ ⊢* Ĥ.qy ∞
Ĥ.q0 ⟨Ĥ⟩ ⊢* embedded_H ⟨Ĥ⟩ ⟨Ĥ⟩ ⊢* Ĥ.qn
>
Linz also makes sure to ignore that the behavior of ⟨Ĥ⟩ ⟨Ĥ⟩
correctly simulated by embedded_H cannot possibly reach
either ⟨Ĥ.qy⟩ or ⟨Ĥ.qn⟩ because like everyone else he rejects
simulation out of hand:
>
We cannot find the answer by simulating the action of M on w,
say by performing it on a universal Turing machine, because
there is no limit on the length of the computation.
That statement does not fully reject simulation but is correct in
the observation that non-halting cannot be determied in finite time
by a complete simulation so someting else is needed instead of or
in addition to a partial simulation. Linz does include simulationg
Turing machines in his proof that no Turing machine is a halt decider.
To the best of my knowledge no one besides me ever came up with the
idea of making a simulating halt decider / emulating termination
analyzer.
Textboods may mention the idea but there is not much to say about it,
only that it does not give a complete solution. Linz' proof covers
all Turing machines. A simulating halt decider that is not a Turing
machine is not interesting because there is no known way to make it.
>
UTM. Not a smart thing to say. embedded_H was adapted from a UTM.
When Ĥ is applied to ⟨Ĥ⟩Nope, since the "Halt Status" of the machine represented by ⟨Ĥ⟩ ⟨Ĥ⟩ is BY DEFININTION the behavior of Ĥ ⟨Ĥ⟩, which halts since you admit that embedded_H ⟨Ĥ⟩ ⟨Ĥ⟩ -> Ĥ.qn and thus so does Ĥ ⟨Ĥ⟩.
Ĥ.q0 ⟨Ĥ⟩ ⊢* embedded_H ⟨Ĥ⟩ ⟨Ĥ⟩ ⊢* Ĥ.qy ∞
Ĥ.q0 ⟨Ĥ⟩ ⊢* embedded_H ⟨Ĥ⟩ ⟨Ĥ⟩ ⊢* Ĥ.qn
embedded_H does correctly determine the halt status of the
Linz ⟨Ĥ⟩ ⟨Ĥ⟩ when embedded_H computes the mapping from its
finite string input to the behavior this finite string actually
specifies.
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