#17485: Poset: Documentation of characteristic_polynomial
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Reporter: jmantysalo | Owner:
Type: defect | Status: new
Priority: trivial | Milestone: sage-6.5
Component: combinatorics | Resolution:
Keywords: poset | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by jmantysalo):
Replying to [comment:6 chapoton]:
> I can see no problem with the doc.
>
> The method is defined for graded posets with exactly one minimal
element, as explained.
>
> Such a poset will be ranked. If it is not, the method raises an error.
Then either it should say "If `P` is a '''ranked''' poset with rank `n`
and - -" OR raise "the poset should be '''graded'''", whichever you seem
to be correct.
Should this kind of function be defined with one-line description "Return
the characteristic polynomial of the poset" and longer explanation
starting with "The poset is assumed to be - - and - -. If it is not, an
exception is raised."?
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Ticket URL: <http://trac.sagemath.org/ticket/17485#comment:7>
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