#18393: make Expression.series return an element of SR[[]]
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       Reporter:  rws          |        Owner:
           Type:  enhancement  |       Status:  new
       Priority:  major        |    Milestone:  sage-6.7
      Component:  calculus     |   Resolution:
       Keywords:               |    Merged in:
        Authors:               |    Reviewers:
Report Upstream:  N/A          |  Work issues:
         Branch:               |       Commit:
   Dependencies:               |     Stopgaps:
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Comment (by nbruin):

 - What's the variable of `SR[[]]`? Does it support multivariate power
 series?
  - How does `f=(x^2+y^2+1)` coerce into `SR[['x']]`? Note that `f` is
 already an element of `SR`, so by default it would be a "constant" in
 `SR[['x']]`.

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Ticket URL: <http://trac.sagemath.org/ticket/18393#comment:2>
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