Path: ...!2.eu.feeder.erje.net!feeder.erje.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Mikko Newsgroups: comp.theory Subject: Re: DDD correctly emulated by H0 -- Ben agrees that Sipser approved criteria is met Date: Sat, 29 Jun 2024 11:10:30 +0300 Organization: - Lines: 38 Message-ID: References: <87jzidm83f.fsf@bsb.me.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Sat, 29 Jun 2024 10:10:31 +0200 (CEST) Injection-Info: dont-email.me; posting-host="ef6da5e05d63bfb2c13ebab8d1b7b889"; logging-data="4038628"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19v7MR03UvgdGm7hesOFuzf" User-Agent: Unison/2.2 Cancel-Lock: sha1:CpxNCbzm7ZTqdJTnE7SqGC7AdaM= Bytes: 3200 On 2024-06-28 12:40:57 +0000, olcott said: > On 6/28/2024 3:30 AM, Mikko wrote: >> On 2024-06-27 16:56:56 +0000, olcott said: >> >>> On 6/27/2024 10:35 AM, Mikko wrote: >>>> On 2024-06-27 14:10:02 +0000, olcott said: >>>>> >>>>> In computability theory and computational complexity theory, a >>>>> decision problem is a computational problem that can be posed as >>>>> a yes–no question of the input values. >>>>> https://en.wikipedia.org/wiki/Decision_problem >>>> >>>> That's right. But that question cannot be presented to the decider. >>>> Only the input values can. >>>> >>> In other words you are saying that Turing machines do not >>> typically understand English. >> >> I didn't mean it that generally, only about deciders, but yes, typical >> Turing machines do not understand any English. More specifically, the >> specification of a halt decider (or any typical decider) prevents it >> from being asked in any language. >> > > // The question: Is x > y ? > bool GreaterThan(int x, int y) { return (x > y); } > > Deciders are always asked a yes/no question of their > inputs in their own native language. A call of GreaterThan must give two integers as arguments. There is no place where a question could be put. An integer is not a question. -- Mikko