#12812: Bug in summation of toric divisors
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Reporter: novoselt | Owner: AlexGhitza
Type: defect | Status: new
Priority: major | Milestone: sage-5.0
Component: algebraic geometry | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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Here is the problem:
{{{
sage: P1 = toric_varieties.P1()
sage: print sum([P1.divisor(1)])
V(s) + V(t)
}}}
Which I think comes from
{{{
sage: print P1.divisor(1).parent()(0)
V(s)
}}}
Perhaps, we can allow creation of divisors by indices of rays/variables,
but only in the form `P1.divisor(0)`? Since zero in the group of divisors
should be just zero and other integers don't really make sense.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12812>
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