Path: ...!eternal-september.org!feeder3.eternal-september.org!i2pn.org!i2pn2.org!.POSTED!not-for-mail From: joes Newsgroups: sci.math Subject: Re: The set of necessary FISONs Date: Sat, 22 Feb 2025 13:23:01 -0000 (UTC) Organization: i2pn2 (i2pn.org) Message-ID: <0fc2d595a7f635fb2168c0b696c6a6693e481600@i2pn2.org> References: <340761ab1ceb68741d949331a0c64a3d6d5fa237@i2pn2.org> <5fccdbd91a997aadcfde3843cdc09e3fe7f515cf@i2pn2.org> <453a56f5a2e8545cd171150970864c62ecff7442@i2pn2.org> <1c8c4e43283da583e55f14e9b54c0d8f07864c88@i2pn2.org> <8546e6fc960a636cd84bbd71dd0eaecae1af9a16@i2pn2.org> <71701ee4-7e04-4c1a-b4a5-6a7f4162d6bc@no.org> <338bfe94c8da12f1a4db1ac8c379166f5f8c5d4f@i2pn2.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Sat, 22 Feb 2025 13:23:01 -0000 (UTC) Injection-Info: i2pn2.org; logging-data="1234464"; mail-complaints-to="usenet@i2pn2.org"; posting-account="nS1KMHaUuWOnF/ukOJzx6Ssd8y16q9UPs1GZ+I3D0CM"; User-Agent: Pan/0.145 (Duplicitous mercenary valetism; d7e168a git.gnome.org/pan2) X-Spam-Checker-Version: SpamAssassin 4.0.0 Bytes: 2616 Lines: 17 Am Sat, 22 Feb 2025 12:10:12 +0100 schrieb WM: > On 22.02.2025 11:45, joes wrote: >> Am Thu, 20 Feb 2025 11:29:26 +0100 schrieb WM: >>> On 19.02.2025 18:19, joes wrote: > >>>> If you think UF = X != N, then you need to accept U{} = X. >>> No. I don't know the relation between a FISON and X. >> X is clearly an inductive set, like N. > If X is defined as the true UF (I had overlooked that), then we cannot > apply |X \ {1, 2, 3, ..., n}| = ℵo and then U{} = X does not follow. Why can you not induce over an inductive set? > X is a FISON like every finite union of FISONs. No, X is an obviously infinite union. -- Am Sat, 20 Jul 2024 12:35:31 +0000 schrieb WM in sci.math: It is not guaranteed that n+1 exists for every n.