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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: Moebius <invalid@example.invalid> Newsgroups: sci.math Subject: Re: The reality of sets, on a scale of 1 to 10 [Was: The non-existence of "dark numbers"] Date: Fri, 21 Mar 2025 20:37:15 +0100 Organization: A noiseless patient Spider Lines: 16 Message-ID: <vrkf5b$279ci$1@dont-email.me> References: <vqrbtd$1chb7$2@solani.org> <ae5edd89-d5da-4ff4-a723-485cafa92582@att.net> <vrc8n0$2og7i$2@dont-email.me> <0b8644b2-7027-420e-b187-8214daaf9e3b@att.net> <vrf5bp$1gcun$1@dont-email.me> <b3730bf7-bcd1-4698-b465-6d6ef190b29d@att.net> <vrgm1k$2s8c6$2@dont-email.me> <c81100d7-9354-4c8e-b216-e147cab9b41c@att.net> <vrhrlb$3ta8t$1@dont-email.me> <c0de7504-7d17-42f1-83e8-8767c0859c0c@att.net> <vrj5nh$12273$1@dont-email.me> <efbe60c5-6691-4fd6-8638-589fd95ec8a4@att.net> <vrkabi$233at$1@dont-email.me> <vrkca8$18dh$1@news.muc.de> Reply-To: invalid@example.invalid MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Fri, 21 Mar 2025 20:37:16 +0100 (CET) Injection-Info: dont-email.me; posting-host="1fe1706e9f690cb83ee95849cd29f0ec"; logging-data="2336146"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/403wYeOQPXuBUCC5jfEpo" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:Mqele1OlKv836iDk8VjqtOagpRo= Content-Language: de-DE In-Reply-To: <vrkca8$18dh$1@news.muc.de> Bytes: 2416 Am 21.03.2025 um 19:48 schrieb Alan Mackenzie: > WM <wolfgang.mueckenheim@tha.de> wrote: >> Learn that [...] Cantor [once] has [uttered] that the positive numbers have more >> reality than the even positive numbers. >> He said that is not in conflict with the identical cardinality of both >> sets. And he was right! > > I doubt very much Cantor said such rubbish. Actually, WM is right here. But the notion of "more reality" clearly wasn't meant as a technical term (by Cantor). He -Cantor- was just trying to explain the mathematical fact that 2IN is a PROPER subset of IN, while both sets still have the same cardinality. (I'd dare to bet that this was the only time he ever used that phrase in this context.) Hint: WM is all about words.