#19686: Category of finite posets: lower_set() broken
---------------------------------+-------------------------
Reporter: jmantysalo | Owner:
Type: defect | Status: new
Priority: minor | Milestone: sage-6.10
Component: combinatorics | Resolution:
Keywords: poset | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
---------------------------------+-------------------------
Comment (by nthiery):
Good point: the alias `lower_set` -> `order_ideal` as implemented in the
category `Posets.ParentMethods.lower_set` does not work. One probably
needs to write it as
a trivial method which calls `order_ideal`. The same issue applies to
`upper_set`.
By the way: the rationale for those aliases is that, in the long run, I am
in favor of migrating from `order_ideal` to `lower_set`: the former is
ambiguous with two distinct widely accepted meanings in the community.
Note: this is about (the abstract classes for) posets ; not to the
category infrastructure.
--
Ticket URL: <http://trac.sagemath.org/ticket/19686#comment:1>
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/d/optout.
