Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Mikko Newsgroups: sci.physics.relativity Subject: Re: The first postulate is a truism. Date: Mon, 23 Jun 2025 11:43:48 +0300 Organization: - Lines: 36 Message-ID: <103b444$155i6$1@dont-email.me> References: <10338b9$m1ka$1@dont-email.me> <1rebyzy.1pjth4x1bl89p4N%nospam@de-ster.demon.nl> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Mon, 23 Jun 2025 10:43:49 +0200 (CEST) Injection-Info: dont-email.me; posting-host="69ab797e9b7d0bb3d2ce1268d16bde05"; logging-data="1218118"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/6w3UWyrY05aCUMN2mEFdF" User-Agent: Unison/2.2 Cancel-Lock: sha1:liueFp5SlXGETCte4Zd6OB/zpUw= On 2025-06-22 11:25:52 +0000, J. J. Lodder said: > Mikko wrote: > >> On 2025-06-19 17:37:29 +0000, LaurenceClarkCrossen said: >> >>> Perplexity: >>> >>> "The First Postulate of Special Relativity >>> >>> Statement of the First Postulate >>> >>> The first postulate of special relativity, also known as the principle >>> of relativity, states: >>> >>> The laws of physics are the same in all inertial frames of >>> reference." >>> >>> >>> "truism >>> /?tr?iz?m/ n. a statement that is obviously true and says nothing new >>> or interesting. —truistic/tr?istik/ adj." -Oxford American. >> >> The first postulate is not a truism. It is possible to imagine a world >> where it is not true and to believe that we actually live in a such >> world. > > Applying 'truism' to postulate is a category error anyway, > (but what do we expect from dear Laurence?) I think the (mistaken) idea was that if it is a truism it is wrong to call it a postulate. -- Mikko