#15361: Branching Rules for Exceptional Groups
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Reporter: bump | Owner: bump
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.1
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: bump | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
public/combinat/15361-branching- | faec22739d4590ddc1cc5d72490f5381fbb908fd
rules | Stopgaps:
Dependencies: |
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Comment (by bump):
Replying to [comment:62 vbraun]:
Hopefully all branching rules to maximal subgroups are either implemented
or
constructable as plethysms, but branching to a nonmaximal Levi may or may
not
be implemented. For example, one of the G2 Levi's is implemented, the
other not.
(Neither Levi is a maximal subgroup.)
I'll have to correct the documentation per your comment.
> In the "Non-maximal Levi subgroups and Projection from Reducible Types"
section you say that 'branching_rule("E6","A5","levi") returns a not-
implemented error'. But you did implement it in this patch ;-) Its a good
example, maybe just change it to say that it used to be not implemented
(although it works now). Is there any Levi branching rule that still needs
manual intervention? Maybe that subsection should be changed to just talk
about projection to reducible types?
--
Ticket URL: <http://trac.sagemath.org/ticket/15361#comment:64>
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