#17938: implement common refinement of fans
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       Reporter:  chapoton           |        Owner:
           Type:  enhancement        |       Status:  needs_review
       Priority:  minor              |    Milestone:  sage-6.6
      Component:  geometry           |   Resolution:
       Keywords:  fan, toric,        |    Merged in:
  refinement                         |    Reviewers:  Andrey Novoseltsev
        Authors:  Frédéric Chapoton  |  Work issues:
Report Upstream:  N/A                |       Commit:
         Branch:  u/novoselt/17938   |  9acc6329f0453e71c760111a98af36b5b2e8c83d
   Dependencies:                     |     Stopgaps:
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Comment (by chapoton):

 Sorry, but I do not understand what you do with the reverse morphism. It
 seems like you just do nothing in this `if not(self.is_complete())`
 statement. Does the simple fact of calling `FanMorphism` magically modify
 `subdivision` ?

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Ticket URL: <http://trac.sagemath.org/ticket/17938#comment:5>
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