Path: csiph.com!eternal-september.org!feeder.eternal-september.org!reader01.eternal-september.org!.POSTED!not-for-mail From: Keith Thompson Newsgroups: comp.theory,comp.ai.philosophy,comp.ai.nat-lang,sci.lang.semantics Subject: Re: Simply defining =?utf-8?Q?G=C3=B6del?= Incompleteness and Tarski Undefinability away V24 (Are we there yet?) Date: Tue, 14 Jul 2020 09:53:33 -0700 Organization: None to speak of Lines: 25 Message-ID: <874kqa2g36.fsf@nosuchdomain.example.com> References: <2tCdnb0urbddzpfCnZ2dnUU7-b_NnZ2d@giganews.com> <87k0z85tt0.fsf@nosuchdomain.example.com> <87d0505kmk.fsf@nosuchdomain.example.com> <5Lmdnehh4P6hLZbCnZ2dnUU7-LdQAAAA@giganews.com> <871rle53ff.fsf@nosuchdomain.example.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: reader02.eternal-september.org; posting-host="4502a91299fcc6f473e7c6cd344f8c9a"; logging-data="2398"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+2lmBw3dA4Je6F/ASa+tkX" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) Cancel-Lock: sha1:ruAQjlmFmaOi3Bv/dTjX1sk/73g= sha1:Ql9D4VNTJvhHlqCLC3QlQOdNano= Xref: csiph.com comp.theory:21662 comp.ai.philosophy:22003 comp.ai.nat-lang:2397 olcott writes: > On 7/13/2020 7:46 PM, Keith Thompson wrote: >> olcott writes: >> [...] >>> The single-minded focus of all of these last ten or more threads is >>> how there can be a sentence that is true in a formal system and not >>> provable in this same a formal system. >>> >>> I know it is impossible because: an expression of the language of a >>> formal system that has no mapping in this formal system to Boolean >>> values has no possible way to be true or false IN THIS SYSTEM. >> >> Gödel proved otherwise. Redefining terms doesn't change that. >> >> [...] > > In other words you are claiming that an undecidable sentence has been > decided to be true. No. -- Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com Working, but not speaking, for Philips Healthcare void Void(void) { Void(); } /* The recursive call of the void */