#11843: Bug in trivial abelian group
----------------------------+-----------------------------------------------
Reporter: wuthrich | Owner: joyner
Type: defect | Status: new
Priority: major | Milestone: sage-4.7.2
Component: group theory | Keywords: S-class group, trivial abelian
group
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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The following code
{{{
K.<t> = NumberField(x^2+17)
I = K.ideal(3,t+1)
S = K.primes_above(11)
A = K.S_class_group(S)
A(I)
}}}
produces the error
{{{
TypeError: unsupported operand parent(s) for '*': 'Ambient free module
of rank 1 over the principal ideal domain Integer Ring' and 'Full
MatrixSpace of 0 by 0 dense matrices over Integer Ring'
}}}
The same error can be obtained by
{{{
A.identity()
}}}
The problem seems to arise only when the abelian group is trivial.
I imagine this is not a problem of the class group implementation, but one
of (trivial) abelian group.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11843>
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