#18597: Implement m-Cambrian lattices (using delta sequences)
-------------------------------------+-------------------------------------
Reporter: nathanwilliams | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.8
Component: combinatorics | Resolution:
Keywords: | Merged in:
sagedays64.5,catalan,coxeter,cambrian| Reviewers: Christian Stump
Authors: Nathan Williams | Work issues:
Report Upstream: N/A | Commit:
Branch: | 49aab49c1afb45314bc444114c8385bc557d5ab5
u/stumpc5/implement_m_cambrian_lattices__using_delta_sequences_| Stopgaps:
Dependencies: |
#18590,#18610,#11187 |
-------------------------------------+-------------------------------------
Changes (by chapoton):
* cc: tscrim (added)
Old description:
> Implement m-Cambrian lattices for a finite Coxeter group W and a Coxeter
> element c using the description in arXiv:1503.00710 on D. Armstrong's
> delta sequences. Give a similar (faster) implementation on roots for
> Weyl groups.
New description:
Implement m-Cambrian lattices for a finite Coxeter group W and a Coxeter
element c using the description in :arxiv:`1503.00710` on D. Armstrong's
delta sequences. Give a similar (faster) implementation on roots for Weyl
groups.
--
Comment:
Christian, maybe we could get rid of the dependency to #11187 ?
There is currently a problem with the `Twords` dictionary, because its
keys are essentially in
`Full MatrixSpace of 2 by 2 sparse matrices over Universal Cyclotomic
Field`
but it is evaluated on some elements
`Full MatrixSpace of 2 by 2 dense matrices over Universal Cyclotomic
Field`
Travis, may I ask for your help ?
--
Ticket URL: <http://trac.sagemath.org/ticket/18597#comment:20>
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