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 | 1 | initial version |  |
To circumvent this problem the frozenset (which can't be modified after creation) was invented:
sage: a.add(frozenset(b))
sage: a
{1, frozenset({2})}| | 2 | No.2 Revision |
To circumvent this problem the frozenset (which can't be modified after creation) was invented:
sage: a.add(frozenset(b))
sage: a
{1, frozenset({2})}Another alternative is to use Sage's Set:
sage: a=Set([1])
sage: b=Set([2])
sage: a.union(Set([b]))
{1, {2}}