#5831: [with patch, needs review] reducible root system fixes
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Reporter: bump | Owner: bump
Type: defect | Status: assigned
Priority: major | Milestone: sage-combinat
Component: combinatorics | Keywords:
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Description changed by bump:
Old description:
> The methods simple_roots(), fundamental_weights() and simple_coroots()
> for the ambient space of a root system are supposed to return a family.
> This was never correctly implemented for the reducible types, and the
> patch corrects this.
>
> There are also some changes in weyl_characters.py, where it was assumed
> that the root system was irreducible in a few places. The patch corrects
> this.
>
> The patch is probably correct but I haven't confirmed that it applies
> cleanly to sage-3.4.1.rc3 or that it passes {{{sage --testall}}} so wait
> to review.
New description:
The methods simple_roots(), fundamental_weights() and simple_coroots() for
the ambient space of a root system are supposed to return a family. This
was never correctly implemented for the reducible types, and the patch
corrects this.
There are also some changes in weyl_characters.py, where it was assumed
that the root system was irreducible in a few places. The patch corrects
this.
The patch trac_5831.patch supercedes reducible.patch. It goes on top of
trac_5751-rebased-3.4.1.rc4.patch.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5831#comment:2>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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