Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: John Smith Newsgroups: comp.theory,sci.logic Subject: Re: How Partial Simulations correctly determine non-halting ---Mike Terry Error Date: Wed, 5 Jun 2024 04:13:37 +0200 Organization: A noiseless patient Spider Lines: 30 Message-ID: References: <87h6eamkgf.fsf@bsb.me.uk> <_gWdnbwuZPJP2sL7nZ2dnZfqn_GdnZ2d@brightview.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Wed, 05 Jun 2024 04:13:38 +0200 (CEST) Injection-Info: dont-email.me; posting-host="83860e4324238056892f5ef29ec401be"; logging-data="652848"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+OEYGJI2PpRkcVkypCOoFM" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:7U0KDHRpBovDgVb/9/Q5cJwE1Xc= Content-Language: en-US In-Reply-To: Bytes: 2606 On 5/06/24 04:07, olcott wrote: > On 6/4/2024 8:39 PM, John Smith wrote: >> On 5/06/24 03:33, olcott wrote: >>> On 6/4/2024 8:20 PM, John Smith wrote: >>>> On 4/06/24 20:02, olcott wrote: >>>>> Those words are dead obviously correct about how a partial simulation >>>>> does correctly determine the halt status of this function: >>>>> >>>>> void Infinite_Recursion2(u32 N) >>>>> { >>>>>      H(Infinite_Recursion2, (ptr)N); >>>>> } >>>> >>>> Does Infinite_Recursion2 halt? >>> >>> When halting is defined in the software engineering terms of >>> terminating normally then Infinite_Recursion2 does not even >>> halt when it runs out of stack space and crashes. >> >> H always halts, and never runs out of stack space, because it is a >> decider. How does Infinite_Recursion2 run out of stack space, if H >> doesn't run out of stack space? >> > > When we are on actual physical machines as my fully operational > HH/DD are running put of stack space is possible. > Then increase the stack space until it doesn't run out. Turing machines can't run out of stack space unless you programmed them wrong.