#15322: Testing for antichains and chains in arbitrary posets
------------------------------------------------+--------------------------
Reporter: darij | Owner:
Type: enhancement | Status:
Priority: major | needs_review
Component: combinatorics | Milestone: sage-5.13
Keywords: posets, combinat, categories | Resolution:
Authors: Darij Grinberg | Merged in:
Report Upstream: N/A | Reviewers:
Branch: | Work issues:
Dependencies: #15283 | Commit:
| Stopgaps:
------------------------------------------------+--------------------------
Comment (by darij):
Hi Nathann,
very good observation about the docstring indicating `lt` instead of `le`.
I've changed this now (in the ordered version; the unordered one is right
because it only refers to the set). Also I've added a comment on
`_element_to_vertex` and added your improvement to the antichain code.
I don't understand the issue with calling `compare_elements` (what file is
that in?) and anyway the `compare_elements` method seems to exist only for
finite posets. I have not merged the two `is_chain_of_poset` methods so
far because IMHO using overshadowing by inheritance is nicer than
`getattr` (and probably faster?).
for the '''patchbots'''
apply trac_15322-chains-and-antichains-dg.patch trac_15322-some-edits-
dg.patch
for the '''patchbot'''
apply trac_15322-chains-and-antichains-dg.patch trac_15322-some-edits-
dg.patch
for the '''patchbots''':
apply trac_15322-chains-and-antichains-dg.patch trac_15322-some-edits-
dg.patch
for the '''patchbot''':
apply trac_15322-chains-and-antichains-dg.patch trac_15322-some-edits-
dg.patch
--
Ticket URL: <http://trac.sagemath.org/ticket/15322#comment:5>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/groups/opt_out.
