#7753: Coxeter groups: more Bruhat and weak order features [with patch, needs
work]
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Reporter: nthiery | Owner: nthiery
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-4.3.1
Component: combinatorics | Keywords: Bruhat order, Weak order
Work_issues: | Author: Nicolas M. Thiéry, Daniel Bump
Upstream: N/A | Reviewer: Daniel Bump
Merged: |
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Changes (by bump):
* status: needs_review => needs_work
Comment:
This patch implements the bruhat_order as a cached method and is badly
needed.
With Sage 4.3, this raises an exception at the test in coxeter_groups.py,
line 1010.
The definition of Q could be rewritten:
{{{
W = WeylGroup("B3")
sage: fcn = lambda x,y : x.bruhat_le(y)
sage: Q=Poset((W.list(),fcn))
}}}
Maybe the {{{?!?}}} should be removed from the {{{# long time}}} directive
a couple of lines later since it is unclear what it means.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7753#comment:2>
Sage <http://www.sagemath.org>
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