Re: The set of necessary FISONs

WM explained :

On 22.02.2025 11:34, joes wrote:

Am Sat, 22 Feb 2025 11:12:17 +0100 schrieb WM:

On 21.02.2025 19:45, joes wrote:

Am Fri, 21 Feb 2025 18:17:32 +0100 schrieb WM:

>

Zermelo claims to secure the existence of set Z.
This set can be handled, for instance removed from Z. A set containing
Z is not useful in this context.

Z is not a set containing Z; Z cannot be "removed" from Z.

Of course removing all elements from Z produces the empty set.

But Z \ {Z} = Z, because Z !e Z.

>
Z \ Z = Ø
>
ℕ \ ℕ = Ø
>
ℕ \ {1, 2, 3, ...} = Ø

Wow! This means that there are no differences between a set and itself. IOW the difference set is empty.
Astounding! You can retire now and rest on your laurels.