Opened 5 years ago
Closed 5 years ago
#23165 closed enhancement (fixed)
valence polynomial for posets
Reported by: | chapoton | Owned by: | |
---|---|---|---|
Priority: | minor | Milestone: | sage-8.0 |
Component: | combinatorics | Keywords: | |
Cc: | jmantysalo, darij, boussica | Merged in: | |
Authors: | Frédéric Chapoton | Reviewers: | Darij Grinberg, Travis Scrimshaw |
Report Upstream: | N/A | Work issues: | |
Branch: | 5f45084 (Commits, GitHub, GitLab) | Commit: | 5f45084a37a8053627da60a147b46610c6f2b631 |
Dependencies: | Stopgaps: |
Description
as a simple useful invariant to have, much finer than cardinality, and still multiplicative for Cartesian product.
Change History (12)
comment:1 Changed 5 years ago by
- Branch set to u/chapoton/23165
- Commit set to 88295c7ad7c2fde67034a418983a6743835e23a8
- Status changed from new to needs_review
comment:3 Changed 5 years ago by
I'm not familar with the polygens
construct -- how clean is it?
Also, is there a reason not to define this on the level of digraphs?
comment:4 Changed 5 years ago by
Since you also need the parent, I would do
from sage.rings.polynomial.polynomial_ring_constructor import PolynomialRing R = PolynomialRing(ZZ, 'x,y') x,y = R.gens()
I also agree with Darij that this should be lifted to a method of DiGraph
and then call self._hasse_diagram.valence_polynomial()
.
comment:5 Changed 5 years ago by
- Commit changed from 88295c7ad7c2fde67034a418983a6743835e23a8 to 96bc75877b7631305e9dd0dbbf3a8bfe1dd250a9
Branch pushed to git repo; I updated commit sha1. New commits:
96bc758 | trac 23165 moving the method to digraphs
|
comment:6 Changed 5 years ago by
done
comment:7 Changed 5 years ago by
- Reviewers set to Darij Grinberg, Travis Scrimshaw
- Status changed from needs_review to positive_review
Thanks.
comment:8 Changed 5 years ago by
- Status changed from positive_review to needs_work
pdf docs don't build
comment:9 Changed 5 years ago by
- Commit changed from 96bc75877b7631305e9dd0dbbf3a8bfe1dd250a9 to 5f45084a37a8053627da60a147b46610c6f2b631
comment:10 Changed 5 years ago by
- Status changed from needs_work to needs_review
comment:11 Changed 5 years ago by
- Status changed from needs_review to positive_review
Yes, this is better.
comment:12 Changed 5 years ago by
- Branch changed from u/chapoton/23165 to 5f45084a37a8053627da60a147b46610c6f2b631
- Resolution set to fixed
- Status changed from positive_review to closed
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New commits:
implement valence polynomial for posets