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From: olcott <polcott333@gmail.com>
Newsgroups: comp.theory
Subject: Re: Anyone with sufficient knowledge of C knows that DD specifies
 non-terminating behavior to HHH
Date: Sun, 16 Feb 2025 15:58:14 -0600
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On 2/16/2025 2:02 PM, joes wrote:
> Am Sun, 16 Feb 2025 13:24:14 -0600 schrieb olcott:
>> On 2/16/2025 10:35 AM, joes wrote:
>>> Am Sun, 16 Feb 2025 06:51:12 -0600 schrieb olcott:
>>>> On 2/15/2025 2:49 AM, Mikko wrote:
>>>>> On 2025-02-14 12:40:04 +0000, olcott said:
>>>>>> On 2/14/2025 2:58 AM, Mikko wrote:
>>>>>>> On 2025-02-14 00:07:23 +0000, olcott said:
>>>>>>>> On 2/13/2025 3:20 AM, Mikko wrote:
>>>>>>>>> On 2025-02-13 04:21:34 +0000, olcott said:
>>>>>>>>>> On 2/12/2025 4:04 AM, Mikko wrote:
>>>>>>>>>>> On 2025-02-11 14:41:38 +0000, olcott said:
> 
>>>>>>>> This is the only topic that I will discuss and any
>>>>>> typedef void (*ptr)();
>>>>>> int HHH(ptr P);
>>>>>> int DD()
>>>>>> {
>>>>>>      int Halt_Status = HHH(DD);
>>>>>>      if (Halt_Status)
>>>>>>        HERE: goto HERE;
>>>>>>      return Halt_Status;
>>>>>> }
>>>>>> int main()
>>>>>> {
>>>>>>      HHH(DD);
>>>>>> }
>>>>>> DD  correctly simulated by HHH cannot possibly terminate normally.
>>>>>
>>>>> That claim has already shown to be false. Nothing above shows that
>>>>> HHH does not return 0. If it does DD also returns 0.
>>>> When we are referring to the above DD simulated by HHH and not trying
>>>> to get away with changing the subject to some other DD somewhere else
>>> such as one that calls a non-aborting version of HHH
>>>
>>>> then anyone with sufficient knowledge of C programming knows that no
>>>> instance of DD shown above simulated by any corresponding instance of
>>>> HHH can possibly terminate normally.
>>> Well, then that corresponding (by what?) HHH isn’t a decider.
>> I am focusing on the isomorphic notion of a termination analyzer.
> 
> (There are other deciders that are not termination analysers.)
> 
>> A simulating termination analyzer correctly rejects any input that must
>> be aborted to prevent its own non-termination.
> Yes, in particular itself is not such an input, because we *know* that
> it halts, because it is a decider. You can’t have your cake and eat it
> too.
> 

I am not even using the confusing term "halts".
Instead I am using in its place "terminates normally".

DD correctly simulated by HHH cannot possibly terminate normally.

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