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From: joes <noreply@example.com>
Newsgroups: comp.theory
Subject: Re: Every D(D) simulated by H presents non-halting behavior to H ###
Date: Sat, 18 May 2024 16:18:20 -0000 (UTC)
Organization: i2pn2 (i2pn.org)
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Am Sat, 18 May 2024 10:12:12 -0500 schrieb olcott:
> On 5/18/2024 3:54 AM, immibis wrote:
>> On 16/05/24 16:50, olcott wrote:
>>> On 5/16/2024 5:48 AM, Mikko wrote:

> 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 }
> 
> Explaining how this is incorrect requires the prerequisite knowledge
> that no D correctly simulated by any H of every H/D pair specified by
> the above template ever reaches its own line 06 and halts.
> 
> There are more steps beyond this mandatory prerequisite.
Just for fun, what are these steps if we assumed this claim?

-- 
joes