Hi,
> I always have to include in my graphs functions some part of code to deal
> with the fact that for undirected graphs edges can be returned as (u,v) or
> as (v,u), which my code does not like.... Isn't there a Sage a type of
> variable which is both immutable and not ordered ?
>
> I'd love to have something like Set(u,v) but I also need it to be immutable,
> hashable, etc... ;-)
Precicely Sage Set are designed to be immutable and hashable.
sage: Set((Set((2,3)), Set((1,2)), Set((2,3)) ))
{{1, 2}, {2, 3}}
sage: s = Set((Set((2,3)), Set((1,2)), Set((2,3)) ))
sage: len(s)
2
sage: Set((3,1)) == Set((1,3))
True
So what ?
Cheers,
Florent
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