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From: Richard Damon <richard@damon-family.org>
Newsgroups: comp.theory,sci.logic
Subject: Re: Can you see that D correctly simulated by H remains stuck in
 recursive simulation?
Date: Fri, 24 May 2024 17:03:33 -0400
Organization: i2pn2 (i2pn.org)
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On 5/24/24 3:52 PM, olcott wrote:
> On 5/24/2024 6:14 AM, Richard Damon wrote:
>> On 5/24/24 6:46 AM, Fred. Zwarts wrote:
>>> Op 24.mei.2024 om 03:44 schreef Richard Damon:
>>>> On 5/23/24 1:04 PM, olcott wrote:
>>>>> typedef int (*ptr)();  // ptr is pointer to int function in C
>>>>> 00       int H(ptr p, ptr i);
>>>>> 01       int D(ptr p)
>>>>> 02       {
>>>>> 03         int Halt_Status = H(p, p);
>>>>> 04         if (Halt_Status)
>>>>> 05           HERE: goto HERE;
>>>>> 06         return Halt_Status;
>>>>> 07       }
>>>>> 08
>>>>> 09       int main()
>>>>> 10       {
>>>>> 11         H(D,D);
>>>>> 12         return 0;
>>>>> 13       }
>>>>>
>>>>> The above template refers to an infinite set of H/D pairs where D is
>>>>> correctly simulated by pure function H. This was done because many
>>>>> reviewers used the shell game ploy to endlessly switch which H/D pair
>>>>> was being referred to.
>>>>>
>>>>> *Correct Simulation Defined*
>>>>>     This is provided because every reviewer had a different notion of
>>>>>     correct simulation that diverges from this notion.
>>>>>
>>>>>     A simulator is an x86 emulator that correctly emulates at least 
>>>>> one
>>>>>     of the x86 instructions of D in the order specified by the x86
>>>>>     instructions of D.
>>>>>
>>>>>     This may include correctly emulating the x86 instructions of H in
>>>>>     the order specified by the x86 instructions of H thus calling 
>>>>> H(D,D)
>>>>>     in recursive simulation.
>>>>>
>>>>> *Execution Trace*
>>>>>     Line 11: main() invokes H(D,D); H(D,D) simulates lines 01, 02, 
>>>>> and 03
>>>>>     of D. This invokes H(D,D) again to repeat the process in endless
>>>>>     recursive simulation.
>>>>>
>>>>
>>>> Questions:
>>>>
>>>> By your definiton of "Correct Simulation", you do realize that you 
>>>> have broken connection between the simulaiton not completing and the 
>>>> program described by the input not halting?
>>>>
>>>> Also, you do realize that by your requirement on H just being a 
>>>> "pure function" that does NOT say that you H qualified to be the 
>>>> computational equivalent for a Turing Machine?
>>>>
>>>> That due to your "strange" definition of what D is, you are putting 
>>>> yourself outside of the grounds of "Computation Theory", as that 
>>>> deals with the behavior of specific PROGRAMS, and not the "Program 
>>>> Templates" like your D, our the "Infinite set of H/D pairs"?
>>>>
>>>> Also, your "templagte D" is NOT built per either the Linz or Sipser 
>>>> rules, as both of those had D built with a COPY of H, which is one 
>>>> of your problems with a "Pure Function" as the equivelent. You have 
>>>> shown that your H fails to meet the requirements of a Turing Machine 
>>>> equivalent, as you can't (or it seems you can't) make equivalent 
>>>> copies, where all copies always give the same answer for the same 
>>>> inputs. This is a fundamental property of Turing Machines, which is 
>>>> why just bing a "Pure Function" isn't good enough.
>>>>
>>>> These issus need to be handled or acknowledged, before agreement on 
>>>> your question, as you have shown a history of taking a statement and 
>>>> twisting it (perhaps not intentionally, but because you don't 
>>>> understand what was being communicated) so we need to have a firm 
>>>> understand of what you mean and evidence that you accept the 
>>>> limititation causes by your altered definitions from the problem 
>>>> that you initially claimed to have started on.
>>>>
>>>> Of course, it also means that even if/when you get your agreement, 
>>>> you are no closer to your halting proof, as you have shown that you 
>>>> undestand that you conditions actually tell you NOTHING about the 
>>>> actual behavior of halting.
>>>>
>>>
>>> If olcott wants to be closer to the Linz or Sipser rules, he could do 
>>> so with a small modification: use different names for H. Use H1 when 
>>> called by main and use H2 when called by D. H1 and H2 are not 
>>> required to be exact copies of each other, but only to be 
>>> functionally equivalent. By doing so, a lot of useless discussions 
>>> could be avoided.
>>
>> Yes, he could, but when it was proposed that we make D call its own 
>> identical copy of H, he rejected it saying it wasn't allowed.
>>
>> Of course, the reason it isn't allowed is that it makes his method of 
>> detecting that D calls (a copy of) H not work and his whole method 
>> falls apart, as his H just never answers.
> 
> A copy of D crashes the libx86emu emulator unless the copy
> is very small having less code than the full D.
> 

That is very strange, unless you have configured the emulator for very 
small memory space, and that just shows a limitation to your computation 
implementation, so, you are just admitting that you tools can't handle 
the logic system.

That IS the requirement to be able to claim you are working per the 
specification.

And how were you able to define a new copy H1 to look at H1(D,D) if you 
couldn't instead have H(D,D) look at an D that called H1(D,D) as its 
copy? That should have had the exact same memory issue.

I think you have been caught in an inconsistance.