Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Julio Di Egidio Newsgroups: sci.math Subject: All infinities are countable in ordinary mathematics Date: Sun, 4 May 2025 15:27:01 +0200 Organization: A noiseless patient Spider Lines: 9 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Sun, 04 May 2025 15:27:02 +0200 (CEST) Injection-Info: dont-email.me; posting-host="452704407c9a0d26017a3a7940bd6c99"; logging-data="1954706"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX197jm3QcOE4fJewOgi4/F3aYIEaf9FHmZo=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:vk0O+ejoav6cwKPrfWBgF631glo= Content-Language: en-GB, it If there exist definite transfinite numbers, then their reciprocals must be infinitesimals, not zero. Which is good, as infinitesimals necessitate specific additional laws, reciprocally making the transfinite sharper. And one issue is immediately apparent: infinitesimals are not compatible with the Archimedean principle. Ergo, all infinities are countable in ordinary mathematics. Julio