#11200: Add fibration check to FanMorphism
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Reporter: novoselt | Owner: mhampton
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.7.1
Component: geometry | Keywords: toric
Author: Andrey Novoseltsev | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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The main point of this ticket is to add `FanMorphism.is_fibration` method.
I have also added several related methods and adjusted
containment/embedding methods of fans to accommodate sublattices and make
their behaviour more uniform: now cone containment check is an attempt to
embed the given cone into the fan.
I have also started using `@cached_method` decorator since it is
convenient and its speed and documentation issues should be resolved in
the near future. Note, however, that some methods of fans still should use
manual cache since they need to preprocess arguments first.
Depends on #10882.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11200>
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