#12892: Toric fibration morphisms
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Reporter: vbraun | Owner: AlexGhitza
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.3
Component: algebraic geometry | Resolution:
Keywords: sd40.5 | Work issues: comments and rebasing
Report Upstream: N/A | Reviewers: Andrey Novoseltsev
Authors: Volker Braun | Merged in:
Dependencies: #12361, #13023 | Stopgaps:
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Comment (by vbraun):
Replying to [comment:20 novoselt]:
> E.g. take a blowup of a plane and consider the map from one of the
charts to the plane. How will it factor???
I don't understand what the problem is. This should factor into the
inclusion of the one chart in the blow-up (injective), and the blow-down
morphism (surjective). That is:
{{{
Fan([ Cone([(1,0),(1,1)]) ])
->
Fan([ Cone([(1,0),(1,1)]), Cone([(1,1),(0,1)]) ])
->
Fan([ Cone([(1,0),(0,1)]) ])
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12892#comment:24>
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