#14844: Implement cluster algebras with universal coefficients
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       Reporter:  etn40ff            |        Owner:  sage-combinat
           Type:  enhancement        |       Status:  needs_review
       Priority:  minor              |    Milestone:  sage-6.2
      Component:  combinatorics      |   Resolution:
       Keywords:  cluster algebras   |    Merged in:
        Authors:  Salvatore Stella   |    Reviewers:
Report Upstream:  N/A                |  Work issues:
         Branch:                     |       Commit:
  public/ticket/14844                |  f18c062b579fb1b8f88b92fd50b88ba0ec6df5c8
   Dependencies:                     |     Stopgaps:
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Comment (by chapoton):

 There is even an existing method 'almost_positive_roots' in
 `sage/combinat/root_system/root_lattice_realizations.py`, maybe one should
 use that.

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Ticket URL: <http://trac.sagemath.org/ticket/14844#comment:12>
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