SetPartitions() used to create sets of sets (as of, say January 2013).
That seems to be broken as most common methods on sets will fail (but not
all). Any ideas on a simple fix or a good workaround (or an indication of
what I am doing wrong)? I can use the standard_form() method to get a list
of lists, which I can convert back to sets of sets, but that is very
unnatural (and the reordering will mean lots of needless editing of a very
long string of doctests).
Thanks in advance for any ideas. I can make a trac ticket if that is
called for.
Rob
sage: S = SetPartitions([1,2,3,4], [2,2]).list()
sage: S
[{{1, 2}, {3, 4}}, {{1, 3}, {2, 4}}, {{1, 4}, {2, 3}}]
sage: S[0].cardinality()
2
sage: S[0].intersection(S[1])
AttributeError: 'SetPartitions_setparts_with_category.element_class' object
has no attribute 'intersection'
sage: Set(S[0])
TypeError: Element has no defined underlying set
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