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Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Mikko <mikko.levanto@iki.fi> Newsgroups: comp.theory Subject: Re: DDD simulated by HHH cannot possibly halt (Halting Problem) Date: Fri, 4 Apr 2025 11:09:44 +0300 Organization: - Lines: 19 Message-ID: <vso448$2vtbd$1@dont-email.me> References: <vsnchj$23nrb$2@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Fri, 04 Apr 2025 10:09:44 +0200 (CEST) Injection-Info: dont-email.me; posting-host="92281398402b6c1bb2a3f61b0db94096"; logging-data="3143021"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+QS/jZXakDdTk9W4g0anUB" User-Agent: Unison/2.2 Cancel-Lock: sha1:4tcElPsFvpmjm9zBN7O9hKotQzU= Bytes: 1375 On 2025-04-04 01:27:15 +0000, olcott said: > void DDD() > { > HHH(DDD); > return; > } > > Do you really think that anyone knowing the C > programming language is too stupid to see that > DDD simulated by HHH cannot possibly return? Anyone knowing the C language can see that if DDD() does not halt it means that HHH(DDD) does not halt. The knowledge that that means that HHH is not a decider is possible but not required. -- Mikko