#17659: make symbolic series subclass of Expression
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       Reporter:  rws    |        Owner:
           Type:         |       Status:  needs_work
  enhancement            |    Milestone:  sage-6.10
       Priority:  major  |   Resolution:
      Component:         |    Merged in:
  symbolics              |    Reviewers:  Vincent Delecroix
       Keywords:         |  Work issues:
        Authors:  Ralf   |       Commit:
  Stephan                |  d5cc4241d638adb1329adbc737fa29591fc204b6
Report Upstream:  N/A    |     Stopgaps:
         Branch:         |
  u/rws/17659-1          |
   Dependencies:         |
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Comment (by rws):

 Okay, for some reason printing order here is according to hash value, and
 hash values of symbols are not preserved over different processes. Putting
 `sage: hash(x)` in an arbitrary doctest and testing multiple times shows
 this clearly, also in Sage-6.6. It's just that such series manipulations
 produced an error until recently, so the differences over time couldn't be
 observed.

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Ticket URL: <http://trac.sagemath.org/ticket/17659#comment:42>
Sage <http://www.sagemath.org>
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