Opened 6 years ago
Closed 6 years ago
#21481 closed enhancement (fixed)
Poset documentation polishing: Polynomials
Reported by:  jmantysalo  Owned by:  

Priority:  minor  Milestone:  sage7.4 
Component:  documentation  Keywords:  
Cc:  kdilks  Merged in:  
Authors:  Jori Mäntysalo  Reviewers:  Frédéric Chapoton 
Report Upstream:  N/A  Work issues:  
Branch:  1a4eab1 (Commits, GitHub, GitLab)  Commit:  1a4eab125f5412ac68c8208cb285184322c68522 
Dependencies:  Stopgaps: 
Description
This contains one minimal code change: order_polynomial
now uses as_ideals=False
, which is clearly (but only slightly) faster.
Mostly I just unified wordings from "self
" to "the poset", make expectations always to be a second paragraph ("The poset is expected to be bounded and ranked.") moved some trivial EXAMPLES
to TESTS
and added spaces to examples.
This continues the serie of #18925, #18941, #18959, #19141, #19360, #19435, #21197.
Change History (11)
comment:1 Changed 6 years ago by
 Branch set to u/jmantysalo/posetpolynomials
comment:2 Changed 6 years ago by
 Cc kdilks added
 Commit set to 84e7d0f5c8d90846be8ecc2ef7b91c6fb878870c
 Component changed from PLEASE CHANGE to documentation
 Priority changed from major to minor
 Status changed from new to needs_info
 Type changed from PLEASE CHANGE to enhancement
comment:3 Changed 6 years ago by
expacted
comment:4 Changed 6 years ago by
 Commit changed from 84e7d0f5c8d90846be8ecc2ef7b91c6fb878870c to e35373f15cee7655aa63f3e6e351779f2fc19268
Branch pushed to git repo; I updated commit sha1. New commits:
e35373f  A typo.

comment:5 Changed 6 years ago by
Was it related to enumerating linear extensions by enumerating the number of saturated, strict chains in the lattice of order ideals?
comment:6 followup: ↓ 9 Changed 6 years ago by
polynomial is SageMath
comment:7 Changed 6 years ago by
Found it. It is fvector of a poset, see for example http://www.lehigh.edu/~mas906/papers/defense.ps. I suppose it is worth mentioning, as the question "What integer sequences are fvector for some poset?" has got attention, and it seems to be never formulated as "What polynomials can are chain polynomial for some poset?".
comment:8 Changed 6 years ago by
 Commit changed from e35373f15cee7655aa63f3e6e351779f2fc19268 to 1a4eab125f5412ac68c8208cb285184322c68522
Branch pushed to git repo; I updated commit sha1. New commits:
1a4eab1  Typo; add mention of fvector.

comment:9 in reply to: ↑ 6 Changed 6 years ago by
 Status changed from needs_info to needs_review
comment:10 Changed 6 years ago by
 Reviewers set to Frédéric Chapoton
 Status changed from needs_review to positive_review
let it be.
comment:11 Changed 6 years ago by
 Branch changed from u/jmantysalo/posetpolynomials to 1a4eab125f5412ac68c8208cb285184322c68522
 Resolution set to fixed
 Status changed from positive_review to closed
Kevin: I think that there is another way to look at
chain_polynomial()
, some vector of poset. That is, something we got with.chain_polynomial().coefficients()
. I think it should be mentioned, but now I forgot the name. Do you remember it?New commits:
Docstring modifications.