#17487: Poset: is_slender, documentation for not graded posets
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Reporter: jmantysalo | Owner:
Type: defect | Status: needs_review
Priority: minor | Milestone: sage-6.8
Component: combinatorics | Resolution:
Keywords: poset | Merged in:
Authors: Jori Mäntysalo | Reviewers: Darij Grinberg, Anne
Report Upstream: N/A | Schilling
Branch: | Work issues:
public/ticket/17487 | Commit:
Dependencies: | 4d7ce7648532fcb3f89a1211c69e534bb22d95f4
| Stopgaps:
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Changes (by darij):
* reviewer: => Darij Grinberg, Anne Schilling
* branch: u/jmantysalo/poset__is_slender_needs_checking =>
public/ticket/17487
* commit: c127f9fcd8c85f97fdf761fbd9311d4b50f6618e =>
4d7ce7648532fcb3f89a1211c69e534bb22d95f4
Comment:
I think the notion of "slender" in Grätzer and Kelly has nothing to do
with Stanley's one. Grätzer and Kelly call a poset "slender" if it
contains no 1 + 1 + 1, no 2 + 3, and no 1 + 5, where all numbers are
boldfaced. I take it that the boldfaced numbers are ordinals, but even if
they are not, this seems unlikely to be equivalent to Stanley's
definition.
I have made a review commit. If you're OK with it, please set to pos_rev.
----
New commits:
||[http://git.sagemath.org/sage.git/commit/?id=6e269ce5830a291cd393f8dc4a8f18ddd7d3e31c
6e269ce]||{{{Merge branch 'u/jmantysalo/poset__is_slender_needs_checking'
of git://trac.sagemath.org/sage into slender}}}||
||[http://git.sagemath.org/sage.git/commit/?id=4d7ce7648532fcb3f89a1211c69e534bb22d95f4
4d7ce76]||{{{docstring improved and code optimized}}}||
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Ticket URL: <http://trac.sagemath.org/ticket/17487#comment:11>
Sage <http://www.sagemath.org>
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