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Path: ...!eternal-september.org!feeder2.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: WM <wolfgang.mueckenheim@tha.de> Newsgroups: sci.math Subject: Re: Incompleteness of Cantor's enumeration of the rational numbers Date: Thu, 7 Nov 2024 10:04:42 +0100 Organization: A noiseless patient Spider Lines: 15 Message-ID: <vghvr9$2j3sg$2@dont-email.me> References: <vg7cp8$9jka$1@dont-email.me> <0e67005f-120e-4b3b-a4d2-ec4bbc1c5662@att.net> <vgab11$st52$3@dont-email.me> <ecffc7c0-05a2-42df-bf4c-8ae3c2f809d6@att.net> <vgb0ep$11df5$4@dont-email.me> <35794ceb-825a-45df-a55b-0a879cfe80ae@att.net> <vgg5uq$25spe$4@dont-email.me> <vgglbf$297j4$2@dont-email.me> <vggvub$2au3c$1@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Thu, 07 Nov 2024 10:04:41 +0100 (CET) Injection-Info: dont-email.me; posting-host="a64f40a529641b77af8a405524a5b42f"; logging-data="2723728"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+U4XenZccPfXrLAEGkmyrLmpREOdbY+1g=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:J6HfZDfe0JyeVByXnrhl9zNCWpM= In-Reply-To: <vggvub$2au3c$1@dont-email.me> Content-Language: en-US Bytes: 1852 On 07.11.2024 01:00, Moebius wrote: > Hint: we do not have to "decide" if a > number z is inside or outside of a certain interval. It IS EITHER inside > of the interval OR NOT. (No "decision" necessary.) And when we cover the real axis by intervals --------_1_--------_2_--------_3_--------_4_--------_5_--------_... J(n) = [n - √2/10, n + √2/10] in a clever way, then all rational numbers are midpoints of intervals and no irrational number is outside of all intervals. That is the power of infinity!!! Regards, WM