#16724: simplify_rational() takes very long or forever for some complex 
exponential
expressions
-------------------------+-------------------------------------------------
   Reporter:  gansmann   |            Owner:
       Type:  defect     |           Status:  new
   Priority:  major      |        Milestone:  sage-6.3
  Component:  symbolics  |         Keywords:  simplify symbolics
  Merged in:             |  exponentials
  Reviewers:             |          Authors:
Work issues:             |  Report Upstream:  N/A
     Commit:             |           Branch:
   Stopgaps:             |     Dependencies:
-------------------------+-------------------------------------------------
 For some sums of exponential functions with complex arguments,
 `simplify_rational()` takes very long or is caught in an infinite loop (it
 did not finish in 40 minutes).
 {{{
  (e^(8/5*I*pi) + e^(4/5*I*pi)).simplify_rational()
 }}}

--
Ticket URL: <http://trac.sagemath.org/ticket/16724>
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