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From: "Fred. Zwarts" <F.Zwarts@HetNet.nl>
Newsgroups: comp.theory
Subject: =?UTF-8?Q?Re=3A_Analysis_of_Flibble=E2=80=99s_Latest=3A_Detecting_v?=
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Date: Sat, 24 May 2025 11:59:08 +0200
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Op 24.mei.2025 om 02:30 schreef olcott:
> On 5/23/2025 7:08 PM, Mike Terry wrote:
>> On 23/05/2025 19:37, Keith Thompson wrote:
>>> Ben Bacarisse <ben@bsb.me.uk> writes:
>>>> Mike Terry <news.dead.person.stones@darjeeling.plus.com> writes:
>>> [...]
>>>> And the big picture is that this can be done because false is the
>>>> correct halting decision for some halting computations.  He has said
>>>> this explicitly (as I have posted before) but he has also explained it
>>>> in words:
>>>>
>>>> | When-so-ever a halt decider correctly determines that its input would
>>>> | never halt unless forced to halt by this halt decider this halt
>>>> | decider has made a correct not-halting determination.
>>>
>>> Hmm.  I don't read that the way you do.  Did I miss something?
>>>
>>> It assumes that the input is a non-halting computation ("its input
>>> would never halt") and asserts that, in certain circumstances,
>>> his mythical halt decider correctly determines that the input
>>> is non-halting.
>>>
>>> When his mythical halt decider correctly determines that its input
>>> doesn't halt, it has made a correct non-halting determination.
>>> It's just a tautology.
>>
>> You're reading it the way most people would, and in the way I said 
>> Sipser would be interpreting the oft-quoted "Sipser quote".  I don't 
>> think you've missed anything particularly.
>>
>> I suppose Ben quoted PO saying this, because PO /uses/ it to justify 
>> that a particular /halting/ computation will never halt,  PO's HHH 
>> simulates DDD (which halts) but before DDD halts it spots a pattern in 
>> the simulation, and announces non-halting. 
> 
> In other words you expect that the HHH that DD calls
> to report on the behavior of its caller?
> 
> How the f-ck can it do that?

All information is present in the input specification, including the 
code of DDD and all function called by DDD up to the OS-level.
So, HHH has all the information needed to see the behaviour of the caller.
That HHH has a bug that prevents it see the full specification does not 
change the fact that the specification is in the input.