Sujet : Re: Simulating Termination Analyzer HHH(DDD) rejects input DDD
De : mikko.levanto (at) *nospam* iki.fi (Mikko)
Groupes : comp.theoryDate : 09. Oct 2024, 11:13:41
Autres entêtes
Organisation : -
Message-ID : <ve5l0l$2k5e8$1@dont-email.me>
References : 1 2 3
User-Agent : Unison/2.2
On 2024-10-08 14:02:45 +0000, olcott said:
On 10/8/2024 8:50 AM, Mikko wrote:
On 2024-10-07 20:29:33 +0000, olcott said:
*Simulating Termination Analyzer HHH(DDD) rejects input DDD*
HHH is an emulating termination analyzer that takes the machine
address of DDD as input then emulates the x86 machine language
of DDD until a non-terminating behavior pattern is recognized.
*HHH recognizes this pattern when HHH emulates itself emulating DDD*
void DDD()
{
HHH(DDD);
return;
}
The above code shows that if HHH(DDD) rejects then DDD halts, which
means that no program that rejects DDD is a halting decider.
DDD emulated by each corresponding HHH that can possibly
exist never returns
That does not make sense without a definition of "each corresponding
HHH that can possibly exist".
thus each of the directly executed HHH emulators that does
return 0 correctly reports the above non-terminating behavior.
If HHH returns 0 to DDD then DDD halts, proving that HHH is not a
halt decider.
If HHH returns 1 to DDD then DDD halts, failing to prove that HHH is
not a halt decider.
If HHH does not return to DDD it is not a halt decider.
-- Mikko