#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):
About the divisor `_repr_()`: If you want prefixes then you'll have to
live with `Dalpha`, but I think that is acceptable. I think it would be
better if we could agree on a naming convention that works only with the
homogeneous coordinate names, though. Different users will probably want
different names `Dx`, `D1`, `H`, `E_i`, `O_x`, `f_x` ... depending on
whether they think of it as a divisor, sheaf, or support function. There
is no notation that'll make everyone happy, but if we could do `_repr_()`
with just the homogeneous coordinates then the output will be at least
uniform.
How about
* `O(x*z/y^2)`
* `The divisor {x=0}-2*{y=0}+{z=0}`
* Or just `{x=0}-2*{y=0}+{z=0}`
As for the implementation, I very much prefer stuffing everything into
`_repr_`/`_latex_`.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9337#comment:27>
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