Bernards Paradox. Anything is a set even the empty set. And the empty set 
contains itself. Axiom 11 is the source of the paradox.
Regards
Alan
    On Thursday, 23 February 2023 at 13:13:33 GMT, Dima Pasechnik 
<dimp...@gmail.com> wrote:  
 
 I opened
https://github.com/sagemath/sage/issues/35178
on this

On Thu, Feb 23, 2023 at 9:17 AM 'Peter Mueller' via sage-support
<sage-support@googlegroups.com> wrote:
>
> Secundum non datur ...:
>
> sage: L = {0}
> sage: L == Set(L)
> True
> sage: L != Set(L)
> True
>
> How can this happen?! With  the python bulltin `set` instead of `Set` I get 
> the expected behavior though. (I'm using Sage version 9.8.)
>
> -- Peter Mueller
>
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