Re: D correctly simulated by H cannot possibly halt --- templates and infinite sets --- deciders

Liste des GroupesRevenir à s logic 
Sujet : Re: D correctly simulated by H cannot possibly halt --- templates and infinite sets --- deciders
De : F.Zwarts (at) *nospam* HetNet.nl (Fred. Zwarts)
Groupes : comp.theory sci.logic
Date : 30. May 2024, 22:59:12
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <v3apb1$1rm2e$2@dont-email.me>
References : 1 2 3 4 5 6 7 8
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Op 30.mei.2024 om 22:15 schreef olcott:
On 5/30/2024 2:32 PM, Fred. Zwarts wrote:
Op 30.mei.2024 om 21:01 schreef olcott:
On 5/30/2024 1:50 PM, Fred. Zwarts wrote:
Op 30.mei.2024 om 19:00 schreef olcott:
On 5/30/2024 10:20 AM, Fred. Zwarts wrote:
Op 30.mei.2024 om 16:43 schreef olcott:
On 5/28/2024 11:16 AM, olcott wrote:
>
When Ĥ is applied to ⟨Ĥ⟩
Ĥ.q0 ⟨Ĥ⟩ ⊢* embedded_H ⟨Ĥ⟩ ⟨Ĥ⟩ ⊢* Ĥ.qy ∞
Ĥ.q0 ⟨Ĥ⟩ ⊢* embedded_H ⟨Ĥ⟩ ⟨Ĥ⟩ ⊢* Ĥ.qn
>
*Formalizing the Linz Proof structure*
∃H  ∈ Turing_Machines
∀x  ∈ Turing_Machines_Descriptions
∀y  ∈ Finite_Strings
such that H(x,y) = Halts(x,y)
>
>
A decider computes the mapping from finite string inputs to
its own accept or reject state.
>
A decider does not and cannot compute the mapping from
Turing_Machine inputs to its own accept or reject state.
>
Halts(x,y) would report on the direct execution of x(y) thus ignores
the pathological behavior of x correctly simulated by pure function H.
This makes Halts(x,y) an incorrect measure of the correctness of H(x,y).
>
Why are you referring to the 'pathological behavior of x' if your claim is that the simulator does not even reach the part of DD (below) that contradicts the result of HH? This 'pathological behavior of x' is completely irrelevant.
>
It is totally relevant because it is the reason why D correctly
simulated by H cannot possibly halt.
>
Incorrect. Your own words are that lines 04, 05 and 06 are nor reachable for the simulator.
>
Because D correctly simulated by H remains stuck in recursive simulation
because D calls H(D,D) in recursive simulation D cannot possibly reach
past its own line 03.
>
You must must 100% complete attention to the exact words that I exactly say.
>
>
If you ask to 100% attention, please, pay also attention to the replies and read more than the first few words. You remove most of my reply, probably because you did not read them.
>
 I soon as yo show that you are starting with a fundamentally false assumption I stop reading.
 
The fact that D does not reach past line 03, means that lines 04, 05 and 06 do not play a role in the decision.
 OK
 
Do you understand C?
 I learned C back when K&R was the standard and have been a professional
C++ software engineer for two decades. I have been professional
programmer since 1984.
 
If line 04 cannot be reached, lines 05 and 06 do not cause any behaviour. In particular no 'pathological' behaviour.
>
 The reason why these lines can't be reached is that D calls H(D,D)
in recursive simulation. This relationship between H and D is
typically called pathological.
 
It is H that keeps repeating the simulation of D
 D calls H(D,D) in recursive simulation until H stops this.
THIS IS D'S FAULT!
Shouting does not make it true! It shows a lack of reasoning.
This is a fundamentally false assumption, so I stop reading here.
It is not D's fault. It is H's choice to start the simulation, not D's. D does not even know of simulation at all. D is assumed to call a decider that is required to halt, so it is H's task to halt the decision process, not D's. But H fails to halt: H keeps simulating H in recursive simulation, but if the simulation of H would halt (that is a requirement), then D would continue with line 04. Every competent C programmer can see that. But the simulation of H violates that requirement.
The fact that H gets stuck in recursive simulation is inherent to a simulating halt decider. That makes a simulating halt decider a bad idea.

Date Sujet#  Auteur
28 May 24 * D correctly simulated by H cannot possibly halt --- templates and infinite sets253olcott
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