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From: Richard Damon <richard@damon-family.org>
Newsgroups: sci.math
Subject: Re: How many different unit fractions are lessorequal than all unit
 fractions?
Date: Wed, 11 Sep 2024 21:04:15 -0400
Organization: i2pn2 (i2pn.org)
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On 9/11/24 3:40 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. Note that 
> between any pair of visible real numbers there are many dark real numbers.
> 
> Regards, WM
> 

No, Open intervals are intervals that exclude the endpoint from the 
interval, and thus don't HAVE an "endpoint".

But the, you call what you don't understand as "dark" so you think you 
don't need to understand it.