#4521: Trivial permutation group enumeration bug
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Reporter: kohel | Owner: joyner
Type: defect | Status: new
Priority: major | Milestone:
Component: group_theory | Keywords:
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1. This gives an error:
sage: G = PermutationGroup([])
sage: G.list()
2. Permutation group should take an argument for the degree, e.g.:
sage: G = PermutationGroup([],degree=4)
3. Permutation group should set the degree correctly:
sage: G = PermutationGroup([[]])
sage:
sage: G.list()
[()]
sage: G.degree()
1
sage: G = PermutationGroup([[1]])
sage: G.degree()
1
The first group should have degree 0.
3. Degree 0 should really be supported or
we will have difficulties with automorphism
groups of boundary cases. Currently this
gives an error:
sage: SymmetricGroup(0)
Certainly these examples should go into the
docstrings.
Most of these can be trivially fixed, but
it would be good if someone could review
permutation groups with a view to catching
these problems before they arise.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4521>
Sage <http://sagemath.org/>
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