On Fri, Jan 9, 2009 at 3:38 PM, Mike Hansen <mhan...@gmail.com> wrote:
>
> On Fri, Jan 9, 2009 at 3:36 PM, John H Palmieri <jhpalmier...@gmail.com>
> wrote:
>>
>> Is this a bug?
>>
>> sage: Set([])
>> {}
>> sage: Set(Set([]))
>> {}
>> sage: Set([]) == Set(Set([]))
>> True
>
> This is because Set takes a list (iterable) for all the of the
> elements of the set. So, if you want to construct the set containing
> the empty set, you'd do the following:
>
> sage: e = Set([])
> sage: ee = Set([e])
> sage: e
> {}
> sage: ee
> {{}}
> sage: e == ee
> False
Yep. Think "coercion" -- Set(foo) makes foo into a set.
It doesn't make the set containing foo.
William
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