#18944: Posets: maximal_chains() partial-option broken
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Reporter: jmantysalo | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.8
Component: combinatorics | Resolution:
Keywords: posets | Merged in:
Authors: Jori Mäntysalo | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/maximal_chains | eeefd9d2c4184a3f60f505a7851ec3ff16eb7bf0
Dependencies: | Stopgaps:
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Comment (by kdilks):
As best I can tell, this isn't a broken function, it's bad input.
{{{[1,2]}}} represents the two incomparable elements of
{{{BooleanLattice(2)}}}, so they'll never be the start of a maximal chain.
I think the better course of action would be to implement a check to
ensure that {{{partial}}} is a saturated chain in the poset, starting with
a minimal element.
I think the description also needs to be clarified, because it's not clear
just from reading it whether {{{partial=[0,1]}}} means listing all maximal
chains with minimal element 0 or minimal element 1 (which is not what this
does), or if it it means listing all maximal chains that have 0 as the
minimal element and 1 as it's second element (which is what it does).
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Ticket URL: <http://trac.sagemath.org/ticket/18944#comment:5>
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