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From: WM <wolfgang.mueckenheim@tha.de>
Newsgroups: sci.math
Subject: Re: The set of necessary FISONs
Date: Sun, 2 Feb 2025 12:34:55 +0100
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On 02.02.2025 01:33, Richard Damon wrote:
> On 2/1/25 1:17 PM, WM wrote:

>> The set of FISONs assumed to satisfy U(A(n)) = ℕ cannot be empty. But 
>> we can prove by induction that every FISON can be discarded without 
>> changing the union. That disproves the assumption.
>>
> And that is your problem, you make assumptions that are unwarented,

I think you've got it! Yes, U(A(n)) is not ℕ.

Regards, WM