#6574: Type issue in is_quadratic_twist
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Reporter: wuthrich | Owner: davidloeffler
Type: defect | Status: new
Priority: trivial | Milestone: sage-4.1.1
Component: elliptic curves | Keywords: elliptic curve, quadratic twist
Reviewer: | Author:
Merged: |
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Comment(by cremona):
Well spotted. But note that this is in ell_field and general fields will
not have integers, so the consistent return type should be that of the
field. So I would rather change the second behaviour, which will mean
that when K is QQ we coerce back to ZZ after taking the square-free part.
On second thoughts we already have special code for QQ (calling
squarefree_part()) so we could make a special case here and return a
square-free integer (in ZZ) in all cases for K=QQ, and otherwise return a
field element. Is that acceptable?
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6574#comment:1>
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