#16892: Function to check if a poset containt a subposet isomorphic to another
poset
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-wishlist
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/function_to_check_if_a_poset_containt_a_subposet_isomorphic_to_another_poset|
f13f2385d2b79adad5dae8282162d776bb8114bd
Dependencies: 16909 | Stopgaps:
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Comment (by ncohen):
Hello !
> 1) As this is not urgent change, I made another ticket (16909). Of
course I could also do this without another one, adding note like "After
transitive_closure() is fixed, change..."
I just wrote a commit and added Travis and Simon in cc. The patch is very
short, so it may not take very long before it is reviewed !
> Can 'induced' be later added with default value to `True`?
I believe that `False` (i.e. the transitive closure version) should be the
default behaviour, I think that it is the most common definition of
'subposet'.
> One more question: What is the meaning of having same documentation and
examples copied to both posets.py and hasse_diagram.py? For example
has_bottom() and actually most of functions?
Why exacty do you want to add a method to !HasseDiagram, given that they
are digraphs and that they already inherit the `subgraph_search` method
which does exactly the same (and even a bit more as it returns the graph)
?
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/16892#comment:12>
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