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From: Richard Damon <richard@damon-family.org>
Newsgroups: comp.theory
Subject: Re: Every D(D) simulated by H presents non-halting behavior to H ###
Date: Mon, 13 May 2024 20:30:12 -0400
Organization: i2pn2 (i2pn.org)
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On 5/13/24 7:00 PM, olcott wrote:
> On 5/13/2024 5:20 PM, immibis wrote:
>> On 13/05/24 16:43, olcott wrote:
>>> On 5/13/2024 4:14 AM, Mikko wrote:
>>>> On 2024-05-13 04:54:30 +0000, immibis said:
>>>>
>>>>> On 10/05/24 19:55, Alan Mackenzie wrote:
>>>>>> [ Followup-To: set ]
>>>>>>
>>>>>> In comp.theory olcott <polcott333@gmail.com> wrote:
>>>>>>
>>>>>> [ .... ]
>>>>>>
>>>>>> I've tried out your much spammed code on GCC (see below).  It is 
>>>>>> clear
>>>>>> you have never built or run this code, which ironically can't 
>>>>>> reach Line
>>>>>> 06.  It can't even reach line 00.
>>>>>>
>>>>>>> Richard tried to get away with D never simulated by H as an example
>>>>>>> of D simulated by H:
>>>>>>
>>>>>>> Message-ID: <v0ummt$2qov3$2@i2pn2.org>
>>>>>>> On 5/1/2024 7:28 PM, Richard Damon wrote:
>>>>>>
>>>>>>> *That people say they know I am wrong yet will not show the 
>>>>>>> detailed*
>>>>>>> *steps of how I am wrong indicates that they are probably liars*
>>>>>>
>>>>>> You have said, or at least implied that your code fragment is 
>>>>>> runnable.
>>>>>> I think you are the liar, here.
>>>>>>
>>>>>>> 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 int main()
>>>>>>> 10 {
>>>>>>> 11   H(D,D);
>>>>>>> 12 }
>>>>>>
>>>>>>
>>>>>> .  These are the diagnostics generated by GCC:
>>>>>>
>>>>> And the halting problem is about Turing machines, anyway.
>>>>
>>>> Not necessarily. The same question can be asked about different 
>>>> machines.
>>>> The restriction to Turing machines is just one way to ensure that the
>>>> problem is well defined.
>>>>
>>>
>>> Well put. All computable functions even if written in C.
>>>
>> C makes the problem more complicated and easier to cheat and harder to 
>> notice cheating. If you haven't cheated,
> 
> *Not if you spend two years researching this and discussing this*
> 
> https://en.wikipedia.org/wiki/Computable_function
> in C is simply a
> https://en.wikipedia.org/wiki/Pure_function

Nope.

> 
>> then all programs can be converted to Turing machines. Turing machines 
>> are long and boring, however, if you haven't cheated then it should be 
>> obvious how they could be converted if someone wanted to spend the time.
>