#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 | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by novoselt):
Hi Volker,
I looked through the code and a possible solution is to catch integers in
`_element_constructor_` of `ToricDivisorGroup` instead of passing them
down to `ToricDivisor`. "Catch" means replace 0 with `None` to construct
the trivial divisor and raise an exception for anything else.
It is not very elegant, but keeps current functionality and `X.divisor(i)`
returning the divisor of the i-th ray still seems quite reasonable to me,
while `X.divisor_group()(i)` is questionable.
If you agree, I'll make the change and try to make it clear in the
documentation of all the methods involved.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12812#comment:1>
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