Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: "Chris M. Thomasson" Newsgroups: sci.math Subject: Re: Incompleteness of Cantor's enumeration of the rational numbers (extra-ordinary) Date: Sun, 5 Jan 2025 14:22:56 -0800 Organization: A noiseless patient Spider Lines: 55 Message-ID: References: <98519289-0542-40ce-886e-b50b401ef8cf@att.net> <8e95dfce-05e7-4d31-b8f0-43bede36dc9b@att.net> <53d93728-3442-4198-be92-5c9abe8a0a72@att.net> <9c18a839-9ab4-4778-84f2-481c77444254@att.net> <6db7afa9-f1e1-4d2b-beba-a5fc7a8b8686@att.net> <53806d5c-f456-4c13-8506-24c0b9ab310e@att.net> <931a709f-7dc7-46ed-a1a2-d0e1b60fc542@att.net> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Sun, 05 Jan 2025 23:22:57 +0100 (CET) Injection-Info: dont-email.me; posting-host="0a9b3b8b2325ec9f2ae161f5c632ce0f"; logging-data="1310612"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19gmv/FVNyxuBbmKhWnun07GuCDfIVm+FI=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:S/V1NMc+ykPZMTEFiZJaVHeMXx4= In-Reply-To: Content-Language: en-US Bytes: 3588 On 1/5/2025 3:07 AM, WM wrote: > On 04.01.2025 17:20, Jim Burns wrote: >> On 1/4/2025 3:42 AM, WM wrote: >>> On 1/3/2025 3:56 PM, Jim Burns wrote: >> >>>> All finite.ordinals removed from >>>> the set of each and only finite.ordinals >>>> leaves the empty set. >>> >>> But removing >>> every ordinal that you can define >>> (and all its predecessors) from ℕ leaves >>> almost all ordinals in ℕ. >>> ∀n ∈ ℕ_def: |ℕ \ {1, 2, 3, ..., n}| = ℵo >> >> ℕ is the set of each and only finite.ordinals. > > Yes. >> |ℕ| := ℵ₀ = |ℕ\{0}| = |ℕ\{0,1}| = ... = >> |ℕ\{0,1,...,n}| = ... >> >> The sequence of end.segments of ℕ >> grows emptier.one.by.one but >> it doesn't grow smaller.one.by.one. > > It does but you cannot give the numbers because they are dark. Here is a dark number for ya, when I realize that you are a teacher... 666 ? > A precise measure must detect the loss of one element. ℵo is no precise > measure but only another expression for infinitely many. >> >>> ∀n ∈ ℕ_def: |ℕ \ {1, 2, 3, ..., n}| = ℵo >> >> ℕ is the set of each and only finite.ordinals. > > Yes. But most of them cannot be named as individuals and then removed > because ℵo will always remain in the set. Collectively however is works > ℕ \ {1, 2, 3, ...} = { }. >> >> Each finite.ordinal is not weird. >> Even an absurdly.large one like Avogadroᴬᵛᵒᵍᵃᵈʳᵒ >> is not weird. > > Numbers which can be individualized are far less than 1 % of |ℕ| > > Regards, WM >