#19063: Coercions and basic arithmetic for complex balls
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       Reporter:  mmezzarobba        |        Owner:
           Type:  enhancement        |       Status:  needs_review
       Priority:  major              |    Milestone:  sage-6.9
      Component:  numerical          |   Resolution:
       Keywords:  arb                |    Merged in:
        Authors:  Marc Mezzarobba    |    Reviewers:
Report Upstream:  N/A                |  Work issues:
         Branch:                     |       Commit:
  u/mmezzarobba/19063-acb            |  448bf24a279abd46d4afdf6d9e0e2c01693da1f5
   Dependencies:  #18546             |     Stopgaps:
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Description changed by mmezzarobba:

Old description:



New description:

 Implement field operations, basic complex number and ball methods (abs
 arg, conjugate, mid, rad...), and some conversions and coercions for
 complex balls. Also make a few changes to real balls for consistency.

 Follow-up ticket: #19082.

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Ticket URL: <http://trac.sagemath.org/ticket/19063#comment:4>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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