#18338: bell_polynomial(n,k) should always return a polynomial
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       Reporter:  tmonteil           |        Owner:
           Type:  defect             |       Status:  needs_review
       Priority:  major              |    Milestone:  sage-6.7
      Component:  combinatorics      |   Resolution:
       Keywords:                     |    Merged in:
        Authors:  Thierry Monteil    |    Reviewers:
Report Upstream:  N/A                |  Work issues:
         Branch:                     |       Commit:
  u/tmonteil/bell_polynomial_n_k__should_always_return_a_polynomial|  
145a97c362ca5faee034430f2a67ce915283fc7e
   Dependencies:                     |     Stopgaps:
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Comment (by tmonteil):

 While we are at it, is there a good reason for the base ring of the
 polynomials to be `QQ` and not `ZZ` ?

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Ticket URL: <http://trac.sagemath.org/ticket/18338#comment:6>
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