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From: WM <wolfgang.mueckenheim@tha.de>
Newsgroups: sci.math
Subject: Re: The set of necessary FISONs
Date: Tue, 18 Feb 2025 16:34:20 +0100
Organization: A noiseless patient Spider
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On 18.02.2025 16:28, joes wrote:
> Am Tue, 18 Feb 2025 16:18:52 +0100 schrieb WM:
>> On 18.02.2025 11:09, joes wrote:
>>> Am Tue, 18 Feb 2025 09:54:02 +0100 schrieb WM:
>>
>>>> Therefore I gave you an example that you should be able to understand:
>>>> If every human has ended, then the human race has ended.
>>>> Analogously: If every FISON has been removed without changing the
>>>> union,
>>>> then the set {F(1), F(2), F(3), ...} has been removed without changing
>>>> the union.
>>> But the union has changed from a nonempty set to an empty one.
>> That's the proof. Nice that you now understand it.
> Um, that proves that you cannot remove everything without changing
> the union. What else could you have meant by that?

We can remove every FISON without changing the *assumed* union ℕ.

Regards, WM