#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 |
-------------------------------------+-------------------------------------
Comment (by stumpc5):
Left to do:
* recheck that the merge of the two methods worked out (i.e., @Nathan
please recheck that I did everything right when deleting the cambrian
stuff from weyl groups and moved it into coxeter groups
* consider a more intelligent way of accessing roots and their methods
from the coxeter groups category. At the moment, Weyl groups have an
ElementMethod {{{reflection_to_root}}}. I think this should be moved into
the parent as this method is only available for reflections, see also
#18634 and #18635.
* provide a preprocessing to turn lists into tuples, otherwise, most users
will see the error
{{{
sage: W = WeylGroup(['A',2])
sage: W.cambrian_lattice([1,2])
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
...
TypeError: unhashable type: 'list'
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/18597#comment:18>
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