#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):
Well `face_lattice`, `faces`, `facet_of`, and `facets` should return
mathematically equivalent results if the cone is in the wrong ambient, so
they don't count. For `adjacent` and `star_generators` I would tend to
let your argument pass that the output would be so wildly wrong that it is
immediately obvious. But `ambient_ray_indices` of a `Cone` always returns
valid index ranges (namely, `range(0,cone.nrays())`).
So I do maintain that this method is particularly dangerous. Note that I
don't want to get rid of the `_ambient_ray_indices` data member, just
{{{
def ray_indices(self, cone):
if self is cone.ambient():
return cone._ambient_ray_indices
# slow fallback
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9972#comment:24>
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