#17809: RealBall: Document input aliasing
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       Reporter:  cheuberg           |        Owner:
           Type:  enhancement        |       Status:  needs_review
       Priority:  minor              |    Milestone:  sage-6.6
      Component:  numerical          |   Resolution:
       Keywords:  arb, RealBall      |    Merged in:
        Authors:  Clemens Heuberger  |    Reviewers:
Report Upstream:  N/A                |  Work issues:
         Branch:                     |       Commit:
  u/cheuberg/rings/real_arb_doc      |  a445cf9b4c2c5417aa3ddb7a1180a564f2648a2b
   Dependencies:  #17194             |     Stopgaps:
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Comment (by fredrik.johansson):

 Is it obvious that "identical real balls" means the same Sage object, not
 different objects with identical values?

 I guess the example should be `z = x * x`, not `z = x^2`, as the latter
 would be correct regardless.

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Ticket URL: <http://trac.sagemath.org/ticket/17809#comment:3>
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