#17030: Knot Theory as a part of GSoC 2014.
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Reporter: amitjamadagni | Owner: amitjamadagni
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.9
Component: algebraic | Resolution:
topology | Merged in:
Keywords: | Reviewers: Miguel Marco, Karl-
Authors: Amit Jamadagni, | Dieter Crisman, Frédéric Chapoton
Miguel Marco | Work issues:
Report Upstream: N/A | Commit:
Branch: | 06aad784cdd03604d77f9f9c7e6c9332a4982fc6
public/ticket/17030 | Stopgaps:
Dependencies: |
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Comment (by fuglede):
Carbon-copying a few remarks from [https://groups.google.com/d/msg/sage-
devel/ByJURRvRgLg/Jv37j-CTCwAJ a sage-devel thread]:
Link.jones_polynomial() has some issues for sufficiently trivial links.
In the following example -- which should be covered -- the method throws
an exception:
{{{
sage: B = BraidGroup(2)
sage: b = B([])
sage: L = Link(b)
sage: L.jones_polynomial()
...
IndexError: list index out of range
}}}
And here's an example where it returns an incorrect value:
{{{
sage: B = BraidGroup(8)
sage: b = B([1])
sage: L = Link(b)
sage: L.jones_polynomial()
1
sage: b.jones_polynomial()
A^12 + 6*A^8 + 15*A^4 + 15/A^4 + 6/A^8 + 1/A^12 + 20
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/17030#comment:124>
Sage <http://www.sagemath.org>
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