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From: "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com>
Newsgroups: sci.math
Subject: Re: The set of necessary FISONs
Date: Tue, 28 Jan 2025 12:57:17 -0800
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On 1/28/2025 7:15 AM, WM wrote:
> On 28.01.2025 13:45, Richard Damon wrote:
>> On 1/28/25 3:58 AM, WM wrote:
> 
>> Many sets of FISONs whose union is N exist, and each of those sets has 
>> a first element.
> 
> Name the first element of only one of those sets which is required in 
> that set.

Think of a tree:


          0
         / \
        /   \
       /     \
      1       2
     / \     / \
    3   4   5   6
.....................


Well, the root node is 0. So, is that an origin point? ;^)