#9972: Add toric lattice morphisms
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Reporter: novoselt | Owner: mhampton
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-4.6
Component: geometry | Keywords:
Author: Andrey Novoseltsev | Upstream: N/A
Reviewer: Volker Braun | Merged:
Work_issues: switch to FanMorphism |
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Comment(by vbraun):
My thought was that it can be expensive to ensure that two cones of a fan
are not the same, and comparing ambient ray indices would be faster. And
you always have to go through all cones of the fan to test membership, so
it will be called often. I thought about whether that is a problem during
the construction, but then I found it easiest to leave that question up to
you ;-)
How about constructing `Cone_of_fan` always though a factory function that
tests (via `Cone.is_equivalent`) if the cone is already in the fan. That
would be simple to implement and we can then rely on uniqueness of the
`Cone_of_fan`.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9972#comment:13>
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