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From: WM <wolfgang.mueckenheim@tha.de>
Newsgroups: sci.math
Subject: Re: How many different unit fractions are lessorequal than all unit
 fractions?
Date: Fri, 13 Sep 2024 19:20:25 +0200
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On 12.09.2024 22:54, Jim Burns wrote:
> On 9/12/2024 1:48 PM, WM wrote:
>> On 12.09.2024 14:29, FromTheRafters wrote:
>>> After serious thinking WM wrote :
> 
>>>> But the endpoints of open intervals
>>>> will remain dark forever.
>>>
>>> Open intervals simply don't contain endpoints,
>>> dark or otherwise.
>>
>> You simply don't know about them.
> 
> The boundary ∂A of set A is

not a result of understanding points.

Fact is that the real axis is nothing but its points. There is no gap. 
Every point has a next point but next to defined points are dark points. 
Next to every defined points there are ℵo dark points. This 
configuration cannot be changed.

Regards, WM