#8585: PermutationGroup and SymmetricGroup on the empty set
------------------------------+---------------------------------------------
Reporter: hivert | Owner: hivert
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.4
Component: group_theory | Keywords: Empty Set, PermutationGroup
Author: Florent Hivert | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by hivert):
A comment by e-mail from Nicolas Borie:
> 1. Est-ce qu'on change ce comportement ?
Trans: Should we change this behavior
{{{
> sage: SymmetricGroup(-12)
> Symmetric group of order 0! as a permutation group
}}}
> 2. Ce serait bien de changer ce message d'erreur :
Trans: This error message is wrong:
{{{
> sage: SymmetricGroup('bla')
>[...]
> ValueError: n (=bla) must be an integer >= 1 or a list (but n has type
> <type 'str'>)
}}}
> --> n must be an integer >= 0 now !!!
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8585#comment:2>
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