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Path: ...!weretis.net!feeder9.news.weretis.net!news.quux.org!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Richard Heathfield <rjh@cpax.org.uk> Newsgroups: comp.theory Subject: Re: Every sufficiently competent C programmer knows --- Very Stupid Mistake Date: Wed, 12 Mar 2025 01:41:10 +0000 Organization: Fix this later Lines: 20 Message-ID: <vqqonm$28lh2$1@dont-email.me> References: <vqntaq$1jut5$1@dont-email.me> <vqp388$1tvqa$1@dont-email.me> <vqpdv9$202b2$2@dont-email.me> <vqperb$20c9k$2@dont-email.me> <E6mcnWv3nMa66036nZ2dnZfqnPWdnZ2d@brightview.co.uk> <vqqnk5$28jtr$1@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Wed, 12 Mar 2025 02:41:11 +0100 (CET) Injection-Info: dont-email.me; posting-host="1e46a42d02300691bd0ac693a83620d5"; logging-data="2381346"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19r7N+9Q6FRO04YeMAkqvWH3IECLIZJROhYdu7LaUmo1g==" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:WSNDD9dGYuQWOSnGx2GxXWkj2+0= In-Reply-To: <vqqnk5$28jtr$1@dont-email.me> Content-Language: en-GB Bytes: 1984 On 12/03/2025 01:22, olcott wrote: > DDD correctly simulated by HHH never reaches its > own "return" instruction and terminates normally > in any finite or infinite number of correctly > simulated steps. If it correctly simulates infinitely many steps, it doesn't terminate. Look up "infinite". But your task is to decide for /any/ program, not just DDD. That, as you are so fond of saying, is 'stipulated', and you can't get out of it. The whole point of the Entscheidungsproblem is its universality. Ignore that, and you have nothing. -- Richard Heathfield Email: rjh at cpax dot org dot uk "Usenet is a strange place" - dmr 29 July 1999 Sig line 4 vacant - apply within