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Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Moebius <invalid@example.invalid> Newsgroups: sci.math Subject: Re: More complex numbers than reals? Date: Mon, 15 Jul 2024 20:53:26 +0200 Organization: A noiseless patient Spider Lines: 18 Message-ID: <v73r76$qh4c$1@dont-email.me> References: <v6ihi1$18sp0$6@dont-email.me> <87jzhsn4bn.fsf@bsb.me.uk> <0_MBIwFUmcbVzDRphAhSXT1Jfqk@jntp> <87sewejgk9.fsf@bsb.me.uk> <ONuEZurz8QD0hIPq2Y0YWmtMwpU@jntp> <87h6cskbed.fsf@bsb.me.uk> <GfPAXYt6LT0UDGoEl_i4274F1No@jntp> <87a5ijk38i.fsf@bsb.me.uk> <G1mVUkcsH2hxNr2IXtw2WTVL2VY@jntp> <3bcdc0e737dc23dca26ae5c0f854210a2909cf15@i2pn2.org> <ApBClomkA5uBYzyehe1GYeW1fcw@jntp> <v73ptm$qcak$1@dont-email.me> Reply-To: invalid@example.invalid MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Mon, 15 Jul 2024 20:53:27 +0200 (CEST) Injection-Info: dont-email.me; posting-host="fa55f4f056f14c196b29b616b953e25b"; logging-data="869516"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18tkhGA2KCXQ3ze7QneP1I+" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:tItBObwPrl8+doUqKN6ARdt3fPM= In-Reply-To: <v73ptm$qcak$1@dont-email.me> Content-Language: de-DE Bytes: 1977 Am 15.07.2024 um 20:31 schrieb Python: > Le 15/07/2024 à 16:46, WM a écrit : >> Probably the idea was discussed that an inclusion-monotonic >> sequence of infinite terms could have an empty intersection. Which is an extremely trivial state of afairs, Mückenheim. Hint: There is no natural number in the intersection of all "endsegments". Extremely trivial reason: For each and every n e IN: n !e {n+1, n+2, n+3, ...}. In other words, An e IN: n !e INTERSECTION_(n e IN) {n+1, n+2, n+3, ...}. >> Every sensible student should be able to comprehend this simple fact.