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From: olcott <polcott333@gmail.com>
Newsgroups: comp.theory
Subject: Re: Can D simulated by H terminate normally?
Date: Fri, 3 May 2024 06:40:20 -0500
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On 5/3/2024 4:17 AM, Mikko wrote:
> On 2024-05-02 14:50:53 +0000, olcott said:
> 
>> On 5/2/2024 4:16 AM, Mikko wrote:
>>> On 2024-05-02 03:22:29 +0000, olcott said:
>>>
>>>> When I had to make changes to Bank's the VISA credit card system
>>>> I had to re-read the VISA change document fifteen times before
>>>> I was confident that I understood every relevant detail.
>>>
>>> It's only because there was no detail that you could not accept.
>>> Had there been one you could have stopped reading as soon you
>>> found it, perhaps even before reading first time to the end.
>>>
>>
>> It was because 99% of the details did not apply to my system
>> that I had to carefully study all of the details to see which
>> ones applied.
>>
>>> Likewise with your proofs: as soon as one error is found there
>>> is no need to read further in order to determine that the proof
>>> is erroneous.
>>>
>>
>> There is no error in this and it is a verified fact not requiring
>> any subjective judgement call:
>>
>> (a) It is a verified fact that D(D) simulated by H cannot
>> possibly reach past line 03 of D(D) simulated by H whether H
>> aborts its simulation or not.
> 
> The use of an ambigouos expression "D(D) simulated by H" can
> be regarded as an error.
> 

Perhaps you C skills are not that great?

Can D correctly simulated by H terminate normally?
00 int H(ptr x, ptr x)  // ptr is pointer to int function
01 int D(ptr x)
02 {
03   int Halt_Status = H(x, x);
04   if (Halt_Status)
05     HERE: goto HERE;
06   return Halt_Status;
07 }
08
09 void main()
10 {
11   H(D,D);
12 }

*Execution Trace*
Line 11: main() invokes H(D,D);

*keeps repeating* (unless aborted)
Line 03: simulated D(D) invokes simulated H(D,D) that simulates D(D)

*Simulation invariant*
D correctly simulated by H cannot possibly reach past its own line 03.


-- 
Copyright 2024 Olcott "Talent hits a target no one else can hit; Genius
hits a target no one else can see." Arthur Schopenhauer