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Path: ...!news.misty.com!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: Mikko <mikko.levanto@iki.fi> Newsgroups: comp.theory Subject: Re: How do computations actually work? Date: Sun, 25 May 2025 11:24:43 +0300 Organization: - Lines: 46 Message-ID: <100uk4b$19gs3$1@dont-email.me> References: <Ms4XP.801347$BFJ.668081@fx13.ams4> <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> <aba700ae0681263a7a5e6ae010c2b3809fcbd040.camel@gmail.com> <100oq63$3tal2$1@dont-email.me> <100p792$3vnfa$1@dont-email.me> <100q6lb$5buc$3@dont-email.me> <100rt3j$jcn6$1@dont-email.me> <100snls$p071$4@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Sun, 25 May 2025 10:24:44 +0200 (CEST) Injection-Info: dont-email.me; posting-host="aa1dcc3c73b18a626e48b434fd480c46"; logging-data="1360771"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18YEuVByeigTszM+MjnWCG5" User-Agent: Unison/2.2 Cancel-Lock: sha1:/v0PICzin7NhVPHcFfg6GXbLS/4= Bytes: 3350 On 2025-05-24 15:13:00 +0000, olcott said: > On 5/24/2025 2:39 AM, Mikko wrote: >> 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. > > int sum(int x, int y) { return 5; } > Does not compute any function because it ignores its inputs. It does. It computes the function that for every argument has the value 5, which is a valid value for an int function. -- Mikko