#17982: Ambient space root poset is broken
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Reporter: nathanwilliams | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.6
Component: combinatorics | Resolution:
Keywords: root poset, | Merged in:
days64 | Reviewers: Nicolas M. Thiéry
Authors: Nathan Williams | Work issues:
Report Upstream: N/A | Commit:
Branch: public/17982 | c1c9fd5f1d9863852075aa79022c0e7e812ad28c
Dependencies: | Stopgaps:
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Description changed by nathanwilliams:
Old description:
> The ambient space for the root system of type A causes a bug in the
> method root_poset().
New description:
The ambient space for the root system of type A causes a bug in the method
root_poset(). In particular, the following code causes an error.
sage: RootSystem(['A', 2]).ambient_space().root_poset()
Error in lines 2-2
Traceback (most recent call last):
File "/projects/35ffe4a3-aac4-4456-85aa-
5c0ad4b5e2d1/.sagemathcloud/sage_server.py", line 875, in execute
exec compile(block+'\n', '', 'single') in namespace, locals
File "", line 1, in <module>
File "/usr/local/sage/sage-6.5/local/lib/python2.7/site-
packages/sage/combinat/root_system/root_lattice_realizations.py", line
1050, in root_poset
root_cover = root + simple_roots[i]
File "/usr/local/sage/sage-6.5/local/lib/python2.7/site-
packages/sage/sets/family.py", line 718, in __getitem__
return self._dictionary.__getitem__(i)
KeyError: 3
I fixed this bug by redefining the dimension to be the number of simple
roots.
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Ticket URL: <http://trac.sagemath.org/ticket/17982#comment:3>
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