#15023: Branching rule A2->A1 never returns
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Reporter: vbraun | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-5.12
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Dependencies:
Stopgaps: |
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Comment (by bump):
> Though generally the default rule works, its just here that it doesn't.
It is a
> convenient feature to let Sage guess the branching rule, so having some
heuristic / a table would be > nice.
I agree and I am thinking the default branching rule should be to do the
obvious thing
in the following cases:
{{{
(1) Restriction is to a Levi subgroup or
(2) The two representations are both standard representations,
e.g. O(n) -> SL(n).
(3) O(n) -> O(n-1) and Sp(2n) -> Sp(2n-2)
}}}
That might be enough for an initial implementation.
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Ticket URL: <http://trac.sagemath.org/ticket/15023#comment:3>
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