Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Mikko Newsgroups: comp.theory Subject: Re: How do computations actually work? Date: Sat, 24 May 2025 10:39:31 +0300 Organization: - Lines: 37 Message-ID: <100rt3j$jcn6$1@dont-email.me> References: <95db078e80b2868ed15a9a9a2af0280d96234a3a@i2pn2.org> <100jo18$2mhfd$1@dont-email.me> <100jpv9$2m0ln$4@dont-email.me> <100kt0c$2tae8$3@dont-email.me> <100ktr7$2reaa$1@dont-email.me> <100l09v$2tae8$5@dont-email.me> <100l1ov$2ul3j$1@dont-email.me> <100l3jh$2v0e9$1@dont-email.me> <100l5c8$2ul3j$2@dont-email.me> <100l75g$2vpq3$1@dont-email.me> <100l887$2ul3i$2@dont-email.me> <100l9gh$30aak$1@dont-email.me> <100lc4o$30pgm$1@dont-email.me> <100ld1u$312c9$1@dont-email.me> <100lg4g$31jt3$1@dont-email.me> <100lkdv$32ib3$1@dont-email.me> <100lmif$32v06$1@dont-email.me> <100lmp3$32ven$1@dont-email.me> <100m319$38k55$2@dont-email.me> <87jz69xlpx.fsf@nosuchdomain.example.com> <100mder$39slu$2@dont-email.me> <100oipb$3oge1$1@dont-email.me> <100onkd$3t5cb$1@dont-email.me> <100oq63$3tal2$1@dont-email.me> <100p792$3vnfa$1@dont-email.me> <100q6lb$5buc$3@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Sat, 24 May 2025 09:39:31 +0200 (CEST) Injection-Info: dont-email.me; posting-host="a92e9505b497257da2a717d3d8824ea7"; logging-data="635622"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/jyKn9rKUbm24y4BJTnDJv" User-Agent: Unison/2.2 Cancel-Lock: sha1:zDYQmR6Ul89wQXF7IINN8023r5A= On 2025-05-23 16:10:19 +0000, olcott said: > On 5/23/2025 2:14 AM, Mikko wrote: >> On 2025-05-23 03:31:15 +0000, olcott said: >> >>> On 5/22/2025 10:23 PM, wij wrote: >>>> On Thu, 2025-05-22 at 21:47 -0500, olcott wrote: >>>>> [cut] >>>> >>>> Q: How do computations actually work? >>>> A: Computation is merely step-by-step algorithm. >>>> Nothing says it has to be TM. >>>> >>>> Do the exercises in textbooks first before any claim of it. >>>> >>> >>> int main() >>> { >>>    DD(); // by what steps can the HHH that DD calls >>> }       // report on the behavior its caller? >> >> If we don't insist that the report be correct: >> 1. guess >> 2. tell what was guessed > > This does not work because all computable functions > that implement termination analyzers must compute > the mapping from their input finite string according > to the behavior that it specifies. Wrong. There is no need to compute "the" mapping if a the report needs not be correct. Some other mapping is enough to produce some report. -- Mikko