Opened 10 years ago

Closed 8 years ago

#11843 closed defect (worksforme)

Bug in trivial abelian group

Reported by: wuthrich Owned by: joyner
Priority: major Milestone: sage-duplicate/invalid/wontfix
Component: group theory Keywords: S-class group, trivial abelian group
Cc: Merged in:
Authors: Reviewers: Chris Wuthrich
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: Stopgaps:

Status badges


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)

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


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.

Change History (4)

comment:1 Changed 8 years ago by wuthrich

  • Status changed from new to needs_review

This is no longer a problem in 5.9. This ticket can be closed now:

sage: K.<t> = NumberField(x^2+17)
sage: I = K.ideal(3,t+1)
sage: S = K.primes_above(11)
sage: A = K.S_class_group(S)
sage: A(I)
Trivial S-ideal class
sage: A.identity()
Trivial S-ideal class

(Sorry that I can't remember what to do with a ticket like this. I just put it to need_review ...

comment:2 Changed 8 years ago by wuthrich

  • Status changed from needs_review to positive_review

... and then to positive_review). Sorry if I do the wrong thing. In any case the ticket can be closed without further action.

comment:3 Changed 8 years ago by jdemeyer

  • Milestone changed from sage-5.10 to sage-duplicate/invalid/wontfix
  • Reviewers set to Chris Wuthrich

comment:4 Changed 8 years ago by jdemeyer

  • Resolution set to worksforme
  • Status changed from positive_review to closed
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