#16697: implement symbolic lower incomplete gamma function
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       Reporter:  rws                |        Owner:
           Type:  defect             |       Status:  needs_review
       Priority:  major              |    Milestone:  sage-6.4
      Component:  symbolics          |   Resolution:
       Keywords:  gamma,             |    Merged in:
  incomplete, special, functions     |    Reviewers:
        Authors:  Ralf Stephan       |  Work issues:
Report Upstream:  N/A                |       Commit:
         Branch:                     |  f8fcbc25f545e412f6c1cf18d58e7f50f4e44cb3
  public/ticket/16697                |     Stopgaps:
   Dependencies:  #17130             |
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Comment (by kcrisman):

 Frédéric, any comments on review, or was this just a drive-by improvement?

 Does the following (from the description) now come out better?
 {{{
 sage: hypergeometric([1],[b],x).simplify_hypergeometric()
 }}}

 Could we add the `gamma(a,0,x)` interface for the lower gamma?  ''Should''
 we?

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Ticket URL: <http://trac.sagemath.org/ticket/16697#comment:35>
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