#15817: Bug in computation of moliens series
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Reporter: nborie | Owner:
Type: defect | Status: new
Priority: critical | Milestone: sage-6.4
Component: group theory | Resolution:
Keywords: moliens series | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by nborie):
Thanks you for this pointer, that's probably a nice first point to
investigate.
I also admit on my side that I am not on the way to fix that. Also, this
ticket is not a defect on my point of view (Yeah, I wrongly opened it...)
since :
* One can re-status this ticket to enhancement since one can want to add
the Moliens series for non transitive group. That would constitute a new
enhancement.
* The documentation (when you write it before opening ticket, as I should
do!!!!!!!) tells clearly :
{{{
Returns the Molien series of a transitive permutation group.
}}}
So, the only things one can do to prevent dummy user to open ticket is to
add a check that make the call explicitly crashing. I worngly opened this
ticket since that works :
{{{
sage: G = PermutationGroup([[(1,2)],[(3,4)]])
sage: G.molien_series()
1/(-x^5 + x^4 + 2*x^3 - 2*x^2 - x + 1)
}}}
Perhaps a check making that would be fine :
{{{
sage: G = PermutationGroup([[(1,2)],[(3,4)]])
sage: G.molien_series()
Traceback :
...
Valuerror : G = (bla bla bla) must be a transitive group. (please
implement me if you can for the general case ...)
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/15817#comment:6>
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