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From: olcott <polcott333@gmail.com>
Newsgroups: comp.theory
Subject: Re: Every D correctly simulated by H never reaches its final state
 and halts
Date: Sat, 18 May 2024 09:55:38 -0500
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On 5/18/2024 8:30 AM, Mikko wrote:
> On 2024-05-17 17:46:29 +0000, olcott said:
> 
>> On 5/17/2024 11:00 AM, Mikko wrote:
>>> On 2024-05-17 15:30:01 +0000, olcott said:
>>>
>>>> On 5/17/2024 2:25 AM, Fred. Zwarts wrote:
>>>>> Op 17.mei.2024 om 03:15 schreef olcott:
>>>>>> The following is self-evidently true on the basis of the
>>>>>> semantics of the C programming language.
>>>>>>
>>>>>> typedef int (*ptr)();  // ptr is pointer to int function
>>>>>> 00 int H(ptr x, ptr x);
>>>>>> 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 int main()
>>>>>> 10 {
>>>>>> 11   H(D,D);
>>>>>> 12   return 0;
>>>>>> 13 }
>>>>>>
>>>>>> In the above case 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.
>>>>>>
>>>>>> Any H/D pair matching the above template where
>>>>>> D(D) is simulated by the same H(D,D) that it calls
>>>>>> cannot possibly reach its own line 06 and halt.
>>>>>>
>>>>>> *This is a simple software engineering verified fact*
>>>>>>
>>>>>
>>>>> Note that olcott defines 'verified fact' as 'proven fact', but he 
>>>>> is unable to show the proof. So, it must be read as 'my belief'.
>>>>
>>>> It is self-evidently true to anyone having sufficient knowledge
>>>> of the semantics of the C programming language.
>>>
>>> No, it isn't, because the C code of H is not shown.
>>
>> *I DON'T KNOW WHY I MUST REPEAT THIS HUNDREDS OF TIMES*
>> The C code that <is> shown provides the template for the
>> infinite set of every D correctly simulated by H.
> 
> You need to repeat this because what you said is defective,

*Try and show exactly how the following is defective*
*Try and show exactly how the following is defective*
*Try and show exactly how the following is defective*

> so it cannot be understood as you want and you don't know how
> you could fix it so that you could say what you want to say.
> 

typedef int (*ptr)();  // ptr is pointer to int function
00 int H(ptr x, ptr y);
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 int main()
10 {
11   H(D,D);
12   return 0;
13 }

In the above case 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);

keeps repeating (unless aborted)
Line 01:
Line 02:
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.

The key thing to note is that no D simulated correctly by any H of every 
H/D pair specified by the above template ever reaches its own line 06 
and halts.




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