On Thu, Jun 25, 2020 at 12:49 PM Ars-Magna <kgn...@gmail.com> wrote:
>
> Is the following a bug ?
>
> sage: Set([[(Integer(0), Integer(0)), (Integer(1), Integer(1))],[(Integer(0), 
> Integer(0)), (Integer(1), Integer(1))]]).cardinality()
>
> 2

hard to say. Note that

sage: Set([[(0,0), (1,1)],[(0,0), (1,1)]]).cardinality()
2
sage: Set([((0,0), (1,1)),((0,0), (1,1))]).cardinality()
1

and even
sage: Set([[0],[0]]).cardinality()
2

- the problem is that lists are not hashable, and  considered unequal.
The problem is that in general testing objects for equality is far
from obvious, might be algorithmically unsolvable, etc.

>
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