#15739: Make Dynkin diagrams coming from a Cartan type immutable and better
respect
edge deletion
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Reporter: tscrim | Owner: sage-combinat
Type: defect | Status: new
Priority: major | Milestone: sage-6.1
Component: combinatorics | Keywords: dynkin diagrams
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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So we don't get behavior like this:
{{{
sage: d = DynkinDiagram(['B',3])
sage: d.edges()
[(1, 2, 1), (2, 1, 1), (2, 3, 2), (3, 2, 1)]
sage: d
O---O=>=O
1 2 3
B3
sage: d.delete_edge(1,2)
sage: d.edges()
[(2, 1, 1), (2, 3, 2), (3, 2, 1)]
sage: d # This iswrong
O---O=>=O
1 2 3
B3
sage: CartanMatrix(d) # So is this
[ 2 -1 0]
[ 0 2 -1]
[ 0 -2 2]
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/15739>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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