#16697: implement symbolic lower incomplete gamma function
-------------------------------------+-------------------------------------
       Reporter:  rws                |        Owner:
           Type:  defect             |       Status:  needs_work
       Priority:  major              |    Milestone:  sage-pending
      Component:  symbolics          |   Resolution:
       Keywords:  gamma,             |    Merged in:
  incomplete, special, functions     |    Reviewers:  Buck Evan
        Authors:  Ralf Stephan       |  Work issues:
Report Upstream:  N/A                |       Commit:
         Branch:                     |  5f4a7fbd8598ef3fb22d8cb61d199dfffea23a8c
  public/ticket/16697                |     Stopgaps:
   Dependencies:  #17130,            |
  sympy-0.7.7                        |
-------------------------------------+-------------------------------------

Comment (by buck):

 There's something not quite right with this branch. I get `gamma_greek` if
 I use combine().

 {{{
 sage: e
 gamma(x, y) + gamma_inc_lower(x, y)
 sage: e.combine()
 gamma(x, y) + gamma_greek(x, y)
 sage: e(x=1, y=2)
 1
 sage: e.combine()(x=1, y=2)
 e^(-2) + gamma_greek(1, 2)
 }}}

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Ticket URL: <http://trac.sagemath.org/ticket/16697#comment:53>
Sage <http://www.sagemath.org>
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