#12892: Toric fibration morphisms
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Reporter: vbraun | Owner: AlexGhitza
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.1
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):
The problem is of course that `z |-> z^2` has two points as the fiber over
{+1}. This is called the index in Hu-Liu-Yau. So we can either
a) Ignore it and just return one irreducible component
b) Return a pair `(toric variety, index)`
c) Return the different connected components `(fiber, fiber, ...,
fiber)`. Note that the embedding map differs by some roots of unity so you
may not be able to write it over QQ...
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12892#comment:15>
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