#9337: Add toric divisors
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Reporter: vbraun | Owner: AlexGhitza
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-4.6
Component: algebraic geometry | Keywords:
Author: Volker Braun | Upstream: N/A
Reviewer: Andrey Novoseltsev | Merged:
Work_issues: |
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Comment(by vbraun):
1. As you said, to test whether the divisor is Cartier we need to call
m(cone). You have to avoid the chicken-egg problem :-)
1. How about (x) - 2*(y) + (z), for example? That would be standard
notation for principal divisors. I think its cumbersome to introduce
prefixes and/or customizable names for every object.
1. Its just that some of the code was written before the
`toric_varieties` library. Feel free to change those. In one or two places
I am explicitly referencing some book/paper, there I was just trying to
enumerate things as in the reference.
1. I'd rather have the divisor, since I can get its cohomology class but
not the other way round.
1. Mathematicians do it, too! e.g. "the divisor is ample" ...
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9337#comment:25>
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