#14610: Energy function for level zero LS paths for all types
-------------------------------------+-------------------------------------
Reporter: mshimo | Owner: mshimo
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.12
Component: combinatorics | Resolution:
Keywords: crystal graph, | Merged in:
days49 | Reviewers: Anne Schilling, Mark
Authors: Mark Shimozono, | Shimozono, Ben Salisbury
Anne Schilling | Work issues:
Report Upstream: N/A | Commit:
Branch: | Stopgaps:
Dependencies: |
-------------------------------------+-------------------------------------
Changes (by jdemeyer):
* status: positive_review => needs_work
Comment:
This `AssertionError` should be changed into a `ValueError` or
`TypeError`:
{{{
sage: RootSystem(['D',2]).root_lattice().simple_root(1).is_short_root()
---------------------------------------------------------------------------
AssertionError Traceback (most recent call
last)
<ipython-input-25-e961de76571c> in <module>()
----> 1
RootSystem(['D',Integer(2)]).root_lattice().simple_root(Integer(1)).is_short_root()
/mazur/release/merger/sage-5.12.beta1/local/lib/python2.7/site-
packages/sage/combinat/root_system/root_lattice_realizations.pyc in
is_short_root(self)
3290 """
3291 ct = self.parent().cartan_type()
-> 3292 assert ct.is_irreducible()
3293 if not ct.is_finite():
3294 raise NotImplementedError, "Implemented only for
irreducible finite root systems"
AssertionError:
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/14610#comment:12>
Sage <http://www.sagemath.org>
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