#13700: fix non-crystallographic "example" of Dynkin diagram
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Reporter: hthomas | Owner: sage-combinat
Type: defect | Status: new
Priority: minor | Milestone: sage-5.5
Component: combinatorics | Resolution:
Keywords: root system, Dynkin diagram | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by hthomas):
The code says the example is a hyperbolic Dynkin diagram and appears on p.
57 of Kac's Infinite Dimension Lie algebras, in exercise 4.9. In Chapter
4, Kac is not assuming his (generalized) Cartan matrices are
symmetrizable, which is probably at the root of the problem.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13700#comment:1>
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