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NNTP-Posting-Date: Fri, 02 Aug 2024 17:39:01 +0000
Subject: Re: Hypothetical possibilities --- Complete Proof
Newsgroups: comp.theory
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From: Mike Terry <news.dead.person.stones@darjeeling.plus.com>
Date: Fri, 2 Aug 2024 18:39:00 +0100
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On 02/08/2024 11:12, Mikko wrote:
> On 2024-08-01 13:29:24 +0000, olcott said:
> 
>> On 8/1/2024 8:12 AM, Fred. Zwarts wrote:
>>> Op 01.aug.2024 om 14:20 schreef olcott:
>>>> On 8/1/2024 3:10 AM, Fred. Zwarts wrote:
>>>>> Op 31.jul.2024 om 23:23 schreef olcott:
>>>>>> On 7/31/2024 3:01 PM, Fred. Zwarts wrote:
>>>>>>> Op 31.jul.2024 om 17:14 schreef olcott:
>>>>>>>> On 7/31/2024 3:44 AM, Fred. Zwarts wrote:
>>>>>>>>> Op 31.jul.2024 om 06:09 schreef olcott:
>>>>>>>>>>
>>>>>>>>>>   machine   stack     stack     machine    assembly
>>>>>>>>>>   address   address   data      code       language
>>>>>>>>>>   ========  ========  ========  =========  =============
>>>>>>>>>> [00002192][00103820][00000000] 55         push ebp
>>>>>>>>>> [00002193][00103820][00000000] 8bec       mov ebp,esp
>>>>>>>>>> [00002195][0010381c][00002172] 6872210000 push 00002172 ; push DDD
>>>>>>>>>> [0000219a][00103818][0000219f] e833f4ffff call 000015d2 ; call HHH(DDD)
>>>>>>>>>> New slave_stack at:1038c4
>>>>>>>>>>
>>>>>>>>>> We don't show any of HHH and show the execution trace of
>>>>>>>>>> of just DDD assuming that HHH is an x86 emulator.
>>>>>>>>>
>>>>>>>>> This assumption is incorrect if it means that HHH is an unconditional simulator that does 
>>>>>>>>> not abort.
>>>>>>>> This algorithm is used by all the simulating termination analyzers:
>>>>>>>> <MIT Professor Sipser agreed to ONLY these verbatim words 10/13/2022>
>>>>>>>>      *If simulating halt decider H correctly simulates its input D*
>>>>>>>>      *until H correctly determines that its simulated D would never*
>>>>>>>>      *stop running unless aborted* then
>>>>>>>>
>>>>>>>>      H can abort its simulation of D and correctly report that D
>>>>>>>>      specifies a non-halting sequence of configurations.
>>>>>>>> </MIT Professor Sipser agreed to ONLY these verbatim words 10/13/2022>
>>>>>>>
>>>>>>> So, Sipser only agreed to a correct simulation, not with an incorrect simulation that 
>>>>>>> violates the semantics of the x86 language by skipping the last few instructions of a halting 
>>>>>>> program.
>>>>>>>
>>>>>>
>>>>>> int DD()
>>>>>> {
>>>>>>    int Halt_Status = HHH(DD);
>>>>>>    if (Halt_Status)
>>>>>>      HERE: goto HERE;
>>>>>>    return Halt_Status;
>>>>>> }
>>>>>>
>>>>>> int main()
>>>>>> {
>>>>>>    HHH(DD);
>>>>>> }
>>>>>>
>>>>>> DD correctly emulated by HHH cannot possibly reach its own
>>>>>> second line. I switched to DDD correctly emulated by HHH
>>>>>
>>>>> But it has been proven that no such HHH exists that simulates itself correctly. So, talking 
>>>>> about a correct simulation by HHH is vacuous word salad.
>>>>>
>>>>>> because only C experts understood the above example and we
>>>>>> never had any of those here.
>>>>>
>>>>> There are many C experts that looked at it, but you only got critic, because you keep hiding 
>>>>> important properties of HHH, which made the conclusion impossible.
>>>>
>>>> The following is all that is needed for 100% complete proof
>>>> that HHH did emulate DDD correctly according to the semantics
>>>> of the x86 language and did emulate itself emulating DDD
>>>> according to these same semantics.
>>>
>>> You are repeating the same false claim with out any self-reflection. It has been pointed out that 
>>> there are many errors in this proof.
>>> Why repeating such errors?
>>>
>>>>
>>>> _DDD()
>>>> [00002172] 55         push ebp      ; housekeeping
>>>> [00002173] 8bec       mov ebp,esp   ; housekeeping
>>>> [00002175] 6872210000 push 00002172 ; push DDD
>>>> [0000217a] e853f4ffff call 000015d2 ; call HHH(DDD)
>>>> [0000217f] 83c404     add esp,+04
>>>> [00002182] 5d         pop ebp
>>>> [00002183] c3         ret
>>>> Size in bytes:(0018) [00002183]
>>>>
>>>> Begin Local Halt Decider Simulation   Execution Trace Stored at:1138cc
>>>> [00002172][001138bc][001138c0] 55         push ebp      ; housekeeping
>>>> [00002173][001138bc][001138c0] 8bec       mov ebp,esp   ; housekeeping
>>>> [00002175][001138b8][00002172] 6872210000 push 00002172 ; push DDD
>>>> [0000217a][001138b4][0000217f] e853f4ffff call 000015d2 ; call HHH(DDD)
>>>
>>> The trace stops and hides what happens when 000015d2 is called.
>>> Olcott is hiding the conditional branch instructions in the recursion.
>>>
>>
>> *Here is the full trace where nothing is hidden*
>> https://liarparadox.org/HHH(DDD)_Full_Trace.pdf
> 
> On page 36 of that "trace"
>     [0000128c][0010379f][00000018] e8e6f4ffff call 00000777
> is not followed by the trace of 00000777. Instead the trace continues
> with the next instruction after the return without any comment about
> the omission. Meaning of 00000777 is not told.
> 

777 is the address of Allocate, which is one of PO's "primative ops" within his "computing model". 
(Similar to his DebugStep().)

It is implemented inside x86utm.exe (his COFF obj code runner), not in the user code DDD/HHH/etc. in 
the obj file, and so we would not expect to see any trace entries for its internals.  When the op 
concludes, rax has the address of the allocated memory, which is consistent with how a normal 
function would have returned the address.

You can say correctly that PO has not explained this, but then he provided the full trace under 
protest, so it's understandable that he has not previously explained everything in it.  I'm 
surprised that his response to your post was both to ignore the question and accuse you of playing 
sadistic head games, as the question was perfectly sensible.

You can look up the 777 address in the listing at the start of the trace and it's there along with a 
bunch of other routines which appear to just return without doing anything - those are all PO's 
primitive ops.  If you feel a need to understand exactly what they do, you'll need to check his 
source code!  (Although for Allocate there is no big surprise...)


So your observation isn't really a problem beyond not being properly explained.  An actual problem 
seen in his trace data is that the simulation of DDD does not track the behaviour of the unsimulated 
DDD.  I.e. his simulation is incorrect.  (PO knows about that but claims it doesn't matter, although 
on other occasions he still claims the simulation is correct.)


Mike.