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From: FromTheRafters <FTR@nomail.afraid.org>
Newsgroups: sci.math
Subject: Re: How many different unit fractions are lessorequal than all unit fractions?
Date: Wed, 11 Sep 2024 17:13:21 -0400
Organization: Peripheral Visions
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References: <vb4rde$22fb4$2@solani.org> <vbd56i$fqa0$1@dont-email.me> <vbdbq3$gdoe$2@dont-email.me> <vbes57$qdqo$2@dont-email.me> <27b3b5e088d82d4475c68a64f50a4bccac9c6f29@i2pn2.org> <vbesjo$27gfe$1@solani.org> <vbf0s9$qp1j$3@dont-email.me> <vbfpf5$utdu$2@dont-email.me> <vbh5qe$19a45$1@dont-email.me> <vbhdf6$1btm1$1@dont-email.me> <vbhffg$1bi3l$3@dont-email.me> <035b16b56a204dfe5e561b3cfe03238167dba39a@i2pn2.org> <vbhiv7$1bi3k$1@dont-email.me> <vbhmj4$1cg6l$4@dont-email.me> <vbkttc$20uoj$3@dont-email.me> <vbl1nq$21t3j$3@dont-email.me> <vbmi4b$2ce0a$1@dont-email.me> <vbn0tb$2d8fc$6@dont-email.me> <vbn3eb$2em18$4@dont-email.me> <vbn45r$2d8fc$10@dont-email.me> <vbnfvo$2gn73$2@dont-email.me> <vbnuqq$2it4a$2@dont-email.me> <vbp9dk$2u3sh$1@dont-email.me> <vbq4ve$31fu6$10@dont-email.me> <fd09e9afa6b0c3041b90c5d788681bb2c92f9d2e@i2pn2.org> <vbs9v8$3l368$3@dont-email.me> <405557f7289631d63264c712d137244c940b9926@i2pn2.org> <vbsroa$3mvi7$2@dont-email.me> <vbt0fs$3pr1d$1@dont-email.me>
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Chris M. Thomasson laid this down on his screen :
> On 9/11/2024 12:40 PM, WM wrote:
>> On 11.09.2024 19:29, joes wrote:
>>> Am Wed, 11 Sep 2024 16:37:30 +0200 schrieb WM:
>>>> On 11.09.2024 04:09, Richard Damon wrote:
>>>>> On 9/10/24 2:59 PM, WM wrote:
>>>>
>>>>>> Real points can be addressed from every side.
>>>>> But only indexed from an actual end point.
>>>> Every real point is an end point (of its subinterval).
>>> What about open intervals?
>> 
>> Open intervals are intervals which have dark endpoints.
>
> What about the gray ones?
>

https://en.wikipedia.org/wiki/Clopen_set#Examples