#17108: IncidenceStructure.degree(set={1,2,3})
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Reporter: ncohen | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.4
Component: combinatorial | Resolution:
designs | Merged in:
Keywords: | Reviewers:
Authors: Nathann Cohen | Work issues:
Report Upstream: N/A | Commit:
Branch: u/ncohen/17108 | f82b9c41095b538a5da29ba015264c24adddc7c4
Dependencies: #17104 | Stopgaps:
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Comment (by dimpase):
Replying to [comment:22 ncohen]:
> > well, at least in set theory 1 is not equal to {1}. Thusly the answer
should be 1, as opposed to `H.degree(1)`, which should be 2.
>
> What I am saying is that from the command there is no way if by
`H.degree(Set([1]))` the user means "give me the degree of the point
Set([1])" or "give me the degree of the set that only contain the point
1".
>
> This is why I need this "set=" parameter to make the difference.
Ah, right. Then I'd just go for `degree()` (for points) and
`subset_degree()` (for subsets), to avoid dealing with paradoxes of set
theory (;-).
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Ticket URL: <http://trac.sagemath.org/ticket/17108#comment:23>
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