#17928: opposite of cones and fans
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Reporter: chapoton | Owner:
Type: enhancement | Status: positive_review
Priority: minor | Milestone: sage-6.6
Component: geometry | Resolution:
Keywords: cone, fan, | Merged in:
negative | Reviewers: Andrey Novoseltsev
Authors: Frédéric Chapoton | Work issues:
Report Upstream: N/A | Commit:
Branch: u/chapoton/17928 | bdf048609e0f1ac50905a9f7b512a5b8bab7b753
Dependencies: | Stopgaps:
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Changes (by novoselt):
* status: needs_review => positive_review
* reviewer: => Andrey Novoseltsev
Comment:
Looks good now.
For fan refinement: assuming they have the same support, you can map
`fan1` to `fan2` by the identity map and allow domain subdivision. Then
the domain `fan3` of the resulting `FanMorphism` will be the minimal
subdivision. It may be nice to implement a method
`fan1.common_refinement(fan2)` returning such a fan after constructing an
opposite morphism as well (this will ensure common support, I am not sure
how to check it otherwise except for the case of complete fans which
should be handled separately for efficiency).
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Ticket URL: <http://trac.sagemath.org/ticket/17928#comment:7>
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