#13223: Implement Poset.is_graded using a polynomial time (linear?) algorithm.
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Reporter: nthiery | Owner: sage-combinat
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-6.4
Component: combinatorics | Resolution:
Keywords: sd40 | Merged in:
Authors: Jori Mäntysalo | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/implement_poset_is_graded_using_a_polynomial_time__linear___algorithm_|
a9896c7e9f9e8e6c6f52a25a3370c2d595e2fecf
Dependencies: #13222 | Stopgaps:
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Changes (by ncohen):
* status: needs_review => needs_info
Comment:
I do not understand. According to Wikipedia, isn't this poset graded by
the function which associates to every element the length of its label ?
http://en.wikipedia.org/wiki/Graded_poset
{{{
sage: d=DiGraph(); d.add_path(["aaaa","aaa","aa","a"]);
d.add_path(["bbb","aa"])
sage: Poset(d).is_graded()
False
}}}
(same result with or without your branch applied)
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/13223#comment:12>
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