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Path: ...!feeds.phibee-telecom.net!3.eu.feeder.erje.net!feeder.erje.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: immibis <news@immibis.com> Newsgroups: comp.theory,sci.logic Subject: Re: Incorrect questions and halt deciders Date: Thu, 14 Mar 2024 05:22:02 +0100 Organization: A noiseless patient Spider Lines: 57 Message-ID: <ustu1a$1dpvm$1@dont-email.me> References: <ustcb1$16vpq$1@dont-email.me> <ustgnh$17l7q$2@dont-email.me> <ustj4e$188pe$1@dont-email.me> <ustog8$1cpcu$1@dont-email.me> <ustqd0$1d61m$1@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Thu, 14 Mar 2024 04:22:03 -0000 (UTC) Injection-Info: dont-email.me; posting-host="c1146dfdd5568c127a162dd734920f71"; logging-data="1501174"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18wPMKi1WGWluJrYZzNuImN" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:ljyUY7HD2+liQhTQHf/kmSe0DYk= Content-Language: en-US In-Reply-To: <ustqd0$1d61m$1@dont-email.me> Bytes: 2935 On 14/03/24 04:19, olcott wrote: > On 3/13/2024 9:47 PM, immibis wrote: >> On 14/03/24 02:15, olcott wrote: >>> On 3/13/2024 7:34 PM, immibis wrote: >>>> On 14/03/24 00:20, olcott wrote: >>>>> For any program H that might determine whether programs >>>>> halt, a "pathological" program D, called with some input, >>>>> can pass its own source and its input to H and then >>>>> specifically do the opposite of what H predicts D will do. >>>>> No H can exist that handles this case. >>>>> https://en.wikipedia.org/wiki/Halting_problem >>>> >>>> It's a different D for every H. A lot of Hs correctly handle Ds for >>>> other Hs. >>>> >>>>> When you ask a man that has never been married: >>>>> Have you stopped beating your wife? >>>> >>>> the correct answer is no. >>> >>> That affirms a false presupposition thus cannot be correct. >> >> it does not. >> > > It seems to me that you don't know linguistics well enough. > I did not read this article. > https://plato.stanford.edu/entries/presupposition/ > >>> >>>>> Although there is a mapping from some men to YES/NO >>>>> there is no mapping from never married men to YES/NO >>>>> thus the question is incorrect for all unmarried men. >>>> >>>> the correct answer is no. >>>> >>>>> Although there is a mapping from some TM/input pairs to YES/NO >>>>> there is no mapping from H/D to YES/NO >>>> H(D) isn't valid input since H has two inputs. >>> >>> there is no mapping from H(D,D) to YES/NO >>> >> >> H(D,D) -> YES >> >> and >> >> H(D,D) -> NO >> >> are two mappings >> > > I did not say that precisely enough. > There is no mapping from the specific TM/input pair: > H(D,D) to Halts(D,D) Be even more precise because this doesn't seem to mean anything.